sought

The U.S. Army is pressing defense contractors to come up with proposals for a new interceptor for the Patriot surface-to-air missile system with a unit cost under $1 million. This is far cheaper — about a fifth of the price — than what the Army is paying for current-generation Patriot PAC-3 Missile Segment Enhancement (MSE) interceptors now.

As a supplement to existing interceptors, a lower-cost alternative would improve Patriot’s cost-per-intercept ratio, especially against lower-tier threats like drones and cruise missiles. The design could also be easier to produce at scale, helping address increasingly worrisome strains on stockpiles and supply chains. These are issues TWZ has been calling attention to for years now, and that have been magnified by Patriot’s heavy use during the latest conflict with Iran.

Last Friday, the Army’s Capability Program Executive (CPE) for Defensive Fires quietly put out a call for information about prospective new low-cost interceptor designs for Patriot.

“We are running a very aggressive Low Cost Interceptor (LCI) missile and missile sub-system competition,” Army Maj. Gen. Frank Lozano, the Army’s Portfolio Acquisition Executive for Fires (PAE Fires), wrote in a post on LinkedIn yesterday, calling attention to the contracting notice. “We will be holding an Industry Day in DC in the very near future. We are looking to generate the greatest amount of interest and participation across the entirety of the missile technology industrial base as possible! This effort is intended to result in multiple awards that can lead to multiple different capable yet affordable missile interceptor solutions!”

The contracting notice itself breaks the $1 million unit price target into four component groups, each of which the Army wants to cost no more than $250,000. These are: Low-Cost Interceptor All-Up Round (AUR) and Fire Control, Low-Cost Rocket Motor, Low-Cost Seeker, and Fire Control and Flight Guidance Implementation. The Army is also seeking information about a potential contractor to serve as the central integrator for all of those “best of breed” elements, which could come from different sources.

When it comes to the complete missile, or AUR, and associated fire control system elements, the Army wants to integrate the missiles into existing M903 trailer-based launchers and leverage the service’s new Integrated Battle Command System (IBCS) network. The M903 is already capable of accommodating newer PAC-3 series interceptors, including the MSE variant, as well as older PAC-2 types that remain in inventory.

Northrop Grumman’s IBCS was designed from the outset with a modular, open-systems approach to make it easier to integrate new systems and functionality as time goes on. You can read more about IBCS in detail in this past TWZ feature.

Northrop Grumman Integrated Air Missile Defense Battle Command System (IBCS) Flight Test

“The Government seeks a component-level solid rocket motor (SRM) capable of meeting the rigorous kinetic and kinematic requirements necessary for an AMD interceptor and capable of being integrated as part of a MOSA AMD interceptor,” according to the contracting notice. “The Government seeks a component-level seeker capable of threat acquisition, tracking, and terminal guidance in support of AMD missions against the stated threat sets within contested and degraded environments (e.g., active electronic warfare, harsh weather, cluttered terrain, etc.).”

“The Government seeks a component-level fire control and flight guidance implementation capable of providing engageability options to the IBCS and providing post-launch management of interceptor flight and communications messaging,” the contracting notice adds.

Overall, the new low-cost interceptors are intended to “serve as supplementals to the Integrated Fires Air and Missile Defense mission against Air Breathing Threats (ABT), Cruise Missiles, Close-Range Ballistic Missiles (CRBM), and Short-Range Ballistic Missiles (SRBM),” per the notice. SRBMs are typically defined as ballistic missiles with maximum ranges under 620 miles. The U.S. military also uses the term CRBM to categorize ballistic threats that can hit targets out to no more than 186 miles.

The Patriot system currently has the ability to engage all of the threats listed above, but that capability comes at a cost. The unit price of each PAC-3 MSE interceptor has risen to approximately $5.3 million, according to the Army’s latest proposed budget for the 2027 Fiscal Year. This is up from a historical average of around $4 million for each one of these missiles. These are also exquisite munitions that take years of lead time to produce, something we will come back to later on.

In 2024, the Army announced that it had axed plans for a new interceptor for Patriot, previously called Lower-Tier Future Interceptor (LTFI), in large part due to projected costs.

“So, right now, the Army has decided that we are not going to move forward on what we were calling a Lower Tier Future Interceptor,” then-Brig. Gen. Lozano said in a live interview with Defense News‘ Jen Judson from the floor of the Association of the U.S. Army’s (AUSA) main annual conference that year. “That was going to be a very expensive endeavor. … Interceptors in that family or class of interceptors are very capable, but also very expensive.”

There had been subsequent signs that a follow-on of some kind to LTFI was in the works. “This year we’re starting a new interceptor program that will have longer range [and] higher altitudes,” Army Lt. Col. Steven Moebes, Product Manager for Lower Tier Interceptors, told Secretary Pete Hegseth during a show-and-tell at the service’s Redstone Arsenal last December, at which media outlets were also present.

War Sec. Pete Hegseth Visits The New Site For U.S. Space Command Headquarters In Huntsville, Alabama

“We want to see if we can bring, from scratch, an interceptor that we can own the IP [intellectual property] for, then go find contract manufacturing,” Secretary of the Army Dan Driscoll also told reporters at the Pentagon just earlier this month, according to The Wall Street Journal.

Driscoll reportedly indicated at that time that the total price point the service was aiming for was $250,000. As mentioned, we now know that this is the cost target for each of the four elements that would combine to form an interceptor costing $1 million or less.

A goal to acquire an anti-air interceptor that is capable of engaging everything from lower-tier air-breathing threats to SRBMs, but does not cost more than $1 million, is still ambitious. It is also in line with Pentagon-wide initiatives to expand the acquisition of lower-cost munitions, including by leveraging new, non-traditional industry partners well beyond established prime defense contractors, and open-architecture approaches. Secretary Driscoll’s mention of Army ownership of the IP also highlights another important aspect of these initiatives, which is aimed at preventing vendor lock, and allows for new competitions to be readily run for AURs and subcomponents.

To reiterate, the new low-cost interceptor is intended to be a supplement to existing options for the Patriot system. At the same time, not all threats require something like a PAC-3 MSE. So, as noted, adding a new relatively cheap alternative to the mix would offer benefits in terms of cost-per-intercept ratio. The price associated with using the system to knock down lower-tier threats, particularly long-range kamikaze drones with unit prices measured in tens or hundreds of thousands of dollars, has become a major talking point in the past decade. Patriot also offers an important layer of defense against shorter-range ballistic missiles in the terminal phases of their flight, which present real threats, as underscored by the latest conflict with Iran, and are increasingly proliferating. As such, being able to provide lower-end terminal ballistic missile defense at a reduced cost point will also be increasingly valuable going forward.

A new, but still capable interceptor for Patriot that is relatively cheap compared to existing types like the PAC-3 MSE could be beneficial when it comes to stockpile management and supply chains, especially if it is also faster to produce at scale. The recent conflict with Iran and other crises in the Middle East in recent years, along with support to allies and partners, particularly Ukraine, have underscored the need for new steps to ensure sufficient numbers of anti-intercepts and other critical munitions remain in U.S. inventory.

Though the Pentagon has insisted that America’s arsenal is still sufficiently stocked to address current and future contingencies, U.S. officials have openly called attention to the potential impacts of high expenditure rates and the importance of diversifying the industrial base that supplies these weapons. The up-front need for a large stockpile of anti-air and other munitions, and the ability to refill it rapidly, not on a timeline measured in years, would only be even pronounced in any future high-end fight, such as one against China in the Pacific.

When it comes to Patriot, there is a separate, but directly related issue of overall capacity. The Army’s Patriot force continues to be inadequate to meet existing demands, let alone what would be required in a future major conflict against an adversary like the Chinese People’s Liberation Army (PLA).

The Army has been working to expand the total size of its Patriot force, as well as improve the capabilities of the system through the addition of new radars and other functionality. The Pentagon has also reached deals with the PAC-3 MSE’s prime contractor, Lockheed Martin, to ramp up production of those interceptors. The service is now looking toward new containerized launchers for the Patriot system, which could be carried by future uncrewed trucks, as well.

The PATRIOT Missile in Action

However, many of these developments are still likely years away from fully materializing and are subject to their own supply chain limitations. The Navy is now working to integrate PAC-3 MSE into the Mk 41 Vertical Launch System (VLS), adding a valuable new anti-air interceptor to its sea-based arsenal, but also further increasing demand. Growing U.S. demand around the Patriot, overall, including as a result of heavy use of the system in the latest conflict with Iran, has had second-order impacts on other customers globally.

Altogether, a new lower-cost interceptor for the Patriot system could be an important, if not increasingly essential, addition to the Army’s arsenal. At the same time, whether the service can meet its goal of finding a missile that meets its significant requirements, but still costs less than $1 million, remains to be seen.

Contact the author: joe@twz.com

The Defense Advanced Research Projects Agency (DARPA) is asking for concepts for drones with a high degree of autonomous operation, as well as remotely-operated containerized systems to launch, recover, and otherwise support them. What DARPA is really interested in is a pairing that can be employed as part of a largely self-sustaining “autonomous constellation” capable of supporting networked swarms consisting of as many as 500 drones at once.

A “constellation” like the one described above, incorporating drones configured for a wide array of roles, including surveillance and reconnaissance and kinetic strike, could be readily deployed in contested areas, or even potentially positioned deep behind enemy lines. Ukraine’s Operation Spiderweb covert drone attacks on several Russian airbases last year, as well as Israel’s near-field attacks from within Iran during the opening phases of the 12 Day War, have already demonstrated the effectiveness of the kind of capability DARPA is seeking. TWZ has also highlighted the value that this kind of drone swarm launch capability would offer on land and at sea on several occasions in the past, including after the Pentagon’s Defense Innovation Unit (DIU) put out a very similar call for proposals earlier this year.

DARPA’s Tactical Technology Office (TTO) first put out its request for information for this containerized drone swarm capability back in April, but has updated the relevant contracting notice several times since then. The latest version was posted online yesterday. At least from what has been shared so far, DARPA has not yet given this project a name.

“Existing commercial, airborne Group 1-3 platforms are limited in endurance, payload capacity, and onboard electrical auxiliary power. When operated as constellations, they typically require substantial infrastructure and basing area [sic] for deployment and recovery. These constellations typically require human involvement to recover, recharge/refuel, and launch again, lacking full autonomy necessary to achieve sustained operations spanning days or longer,” the current version of the contracting notice explains. “The landscape of current platform technologies has broad limitations that require evolution to achieve high-endurance constellations consisting of drones with meaningful payload Size Weight, Power, and Cost (SWaP-C) staged from fully autonomous containers capable of complete mission-cycle management inclusive of launch, sustainment/swap-out, and recovery.”

The U.S. military breaks drones into five different categories. Collectively, drones in Groups 1 and 2 can have maximum weights of up to 55 pounds, fly up to altitudes of 3,500 feet, and have top speeds of up to 250 knots. Group 3 is a very broad middle tier that covers designs that weigh anywhere from 56 to 1,320 pounds and can get up to 18,000 feet, but again have speeds of 250 knots or less. Together, Groups 1 through 3 include a very wide range of drones from small quadcopters all the way up to long-range one-way attack munitions.

Given the aforementioned limitations, “DARPA has identified an exigent need for highly deployable, versatile-SWaP Group 1-3 platforms, operating in autonomous constellations that are stored within, deployed from, recovered in, and managed by a fully autonomous container, to support a variety of payloads and missions in GPS-denied environments,” the contracting notice adds. “Advancements in low-SWaP technologies enable constellations comprising a variety of novel payloads, each requiring dedicated power and weight, but capable of operating in synchrony across the constellation. Constellation populations may comprise up to 500 platforms (number may vary as a function of payload type). Each platform will be equipped with a subsystem or independent payload system with the potential to achieve high operational availability for the combined system over multiple-day periods.”

The notice leaves the requirements for the drones and the containerized launch and recovery systems relatively open-ended.

“Unmanned aerial vehicle (herein referred to as “drones”) in the Group 1-3 space with capabilities for fully autonomous launch, recovery, storage, organization, recharging/refueling, organization, internal logistics management, and pre/post-flight checkout. Proposed drone designs must form a mission-focused, collaborative constellation. Responses must be cognizant of long endurance drone constellations with high operational availability and constellation management,” per the notice. “Novel configurations that enable multi-day continuous operations with their corollary constellation management software (ideally with path optimization and collision deconfliction) and innovative configurations of autonomous container-based deployment solutions are of particular interest to DARPA.”

“Storage containers (herein referred to as “containers”) that provide fully autonomous drone storage, logistics management, launch, recovery, and recharge/refuel, while conforming to the intention of a standardized military container (e.g. Conex, 463L pallets, Tricon, ISU container, etc.),” the notice adds. “Innovative ideas and non-standard containers (e.g. suitcase-based distributed systems, box-based systems) will also be considered within the context of the presented approach, but solutions should be compatible with current military transport capabilities. It is envisioned that these containers shall be self-sufficient with consideration of energy storage, communication equipment, and compute capability.”

DARPA also says it has a tangential interest in a remotely operated “host platform” that could carry the containers to and from a designated area, from which the drones can then be launched and recovered. The contracting notice does not specify whether this would be an air, ground, or maritime platform, or some mixture thereof.

The video in the social media post below shows a launch system for quadcopter-type drones installed on an uncrewed ground vehicle, which the U.S. Army previously tested.

Perhaps most interestingly, DARPA’s contracting notice highlights existing drone-and-launcher combinations used for “preplanned lightshows and commercial activities,” though it also notes that these are not suitable for U.S. military use. Last year, TWZ pointed out how these exact kinds of developments in the commercial entertainment space underscore very real threats posed by more capable, weaponized swarms. That piece came after a Chinese firm, DAMODA, rolled out a containerized system capable of launching, recovering, and recharging thousands of small, electrically-powered quadcopter-type drones at the touch of a button.

China just dropped a new level of drone swarm tech | One-click auto-deploy of thousands | by DAMODA

As we wrote at that time:

It is worth reiterating that DAMODA’s Automated Drone Swarm Container System, at least as it exists now, is clearly designed for entertainment industry use first and foremost. Though the company’s drone light show routines are certainly visually impressive and often go viral on social media, they are pre-scripted and conducted in a very localized fashion. What the company is offering is not a drone swarm capable of performing various military-minded tasks in a highly autonomous manner at appreciable ranges from its launch point.

At the same time, large-scale drone light shows put on by DAMODA (and a growing number of other companies), do highlight, on a broad level, the already highly problematic threats posed by swarms. The new Automated Drone Swarm Container System underscores the additional danger of these same threats hiding in plain sight. The steady proliferation of advances in artificial intelligence and machine learning, especially when it comes to dynamic targeting, will only create additional challenges, as TWZ has explored in detail in this past feature.

This is not theoretical, either. As mentioned, in June [2025], Ukrainian forces launched multiple drone attacks on airbases across Russia with the help of covert launchers loaded on the back of unassuming civilian tractor-trailer trucks. This entire effort was dubbed Operation Spiderweb and took months of planning.

The global market space for containerized launch systems for drones and other payloads is already substantial and continues to grow. Firms in China have been particularly active in this regard, and developments in that country have often also been tied to work on swarming capabilities. Companies in the United States, as well as in Europe and elsewhere around the world, are also increasingly active in this arena.

中国电科陆空协同固定翼无人机“蜂群”系统

Modular Payload System: Launching from Land or Sea

In general, containerized weapon systems offer immense flexibility for employment in ground-based modes, including for rapid deployment to remote or austere locations, as well as on any ship with sufficient deck space. TWZ has previously laid out a very detailed case for why the U.S. Navy should arm its warships with containers loaded with swarms of drones, which you can find here.

Container-like launchers for drones, many of which are mounted on trucks, are also an increasingly common sight globally. Iran has been a particularly significant developer of such capabilities as part of its development of long-range kamikaze drones, as seen in the video below.

Баражуючий іранський боєприпас «Shahed 136»

However, most existing relevant containerized or container-like systems focus on launching payloads rather than recovering them, let alone getting them ready to be relaunched. To date, the latter capabilities have been more of an area of interest for commercial applications. Chinese firm DJI and other companies are increasingly offering container-like ‘docks’ for small commercial drones, though they are generally designed to host just one uncrewed aerial system at a time.

TWZ actually covered much of this already after the DIU announced it was hunting for a very similar-sounding Containerized Autonomous Drone Delivery System (CADDS) capability in February. The CADDS announcement, however, was focused purely on the launch-and-recovery components of the equation, as you can read more about here. How DIU’s effort might be related to what DARPA is exploring now is unknown.

In its call for CADDS proposals, DIU had also highlighted a new, more general emerging demand for more launch capacity to go along with a U.S.-military push to acquire and field hundreds of thousands, if not millions, of new drones, especially smaller types, in the next few years. This has all been spurred on by sweeping new guidance from the Pentagon rolled out last year, aimed at “unleashing U.S. Military drone dominance.” Though DARPA’s contracting notice does not touch on this directly, the capability it is describing would help address this broader question of how U.S. forces were actually employ all of these new uncrewed aerial systems.

Furthermore, as we wrote after DIU put out its call for CADDS proposals:

“Even in an overt operational context, readily deployable containerized systems capable of acting as hubs for drone operations across a broad area with limited manpower requirements could offer a major boost in capability and capacity. Ships, trucks, and aircraft, which could themselves be uncrewed, could be used to bring them to and from forward locations, even in remote areas. If they can support a ‘heterogeneous mix’ of uncrewed aerial systems, a single container could be used to support a wide array of mission requirements, including intelligence, surveillance, and reconnaissance, electronic warfare, kinetic strikes, and/or communications signal relay.”

“An inherent benefit of a drone swarm, in general, is that each individual component does not have to be configured to perform all of the desired tasks. This creates additional flexibility and resilience to threats, since the loss of any particular drone does not necessarily preclude the swarm from continuing its assigned missions. There are tangential design and cost benefits for the drones themselves, since they can be configured to carry only the systems required for their particular mission demands.”

Army Aviation Launches Autonomous Pack Hunters

…

“Drone swarms are only set to become more capable as advancements in autonomy, especially automated target recognition, continue to progress, driven by parallel developments in artificial intelligence and machine learning, as you can read more about here. Future highly autonomous swarms will be able to execute various mission sets even more efficiently and in ways that compound challenges for defenders. Massed drone attacks with limited autonomy already have an inherent capacity to just overwhelm enemy defenses. In turn, electronic warfare systems and high-power microwave directed energy weapons have steadily emerged as some of the most capable options available to tackle swarms, but have their own limitations. Even powerful microwave systems have very short ranges and are directional in nature, and electronic warfare systems may simply not work at all against autonomous drones.”

It remains to be seen whether or not DARPA’s exploration of drone swarms and associated launch systems that could form future “autonomous constellations” leads to an operational capability. Still, this, together with DIU’s CADDS effort, shows clear interest within the U.S. military in making this a reality, if possible.

Contact the author: joe@twz.com

An Amazon MGM Studios executive allegedly solicited kickbacks from an aspiring vendor in exchange for post-production contract awards on shows, according to a recently filed lawsuit.

Joe Eckardt, owner and president of Hollywood-based postproduction services firm Unbreakable Post, alleged that the studio’s head of postproduction, Frank Salinas, told him during a business lunch in 2023 that Salinas could “ensure” Unbreakable Post would be included as an approved vendor to bid on Amazon-affiliated projects.

Salinas would give Eckardt the target budget number for his company’s bid and “effectively guarantee that Unbreakable would be awarded the work,” the lawsuit states.

After the contract was awarded, Eckardt would then pay Salinas a percentage of the project value as a kickback, the lawsuit says.

After Eckardt refused, he alleges that his contract opportunities with Amazon dried up.

He states in the lawsuit that although he had done “substantial” work, served as a postproduction consultant or selected vendor on shows such as the Mexico, Brazil and Argentina productions of the reality series “Temptation Island” and the third season of documentary series “Coach Prime,” he was not selected by Amazon for a contract with those projects.

In 2025, Eckardt alleges that he reported Salinas’ conduct to Amazon and after six months of information gathering, the company told him that “its investigation had concluded and that the allegations were ‘not substantiated.’”

Amazon MGM Studios did not respond to a request for comment. Salinas declined to comment.

Eckardt’s lawsuit was filed Wednesday in Los Angeles County Superior Court. He alleges that he lost more than $1 million in contracts, income and future business opportunities. He is seeking a jury trial.

NASHVILLE, Tenn. — Republican lawmakers in Tennessee forged ahead with a plan Thursday that could carve up a majority-Black congressional district, reshaping it to the GOP’s advantage as part of President Trump’s strategy to try to hold on to a slim House majority in the November midterm elections.

Protesters shouted “No Jim Crow” outside the House and Senate chambers as lawmakers convened to consider the legislation. As the Republican-led House later voted for the new map, Democratic lawmakers locked arms at the front of the chamber while protesters yelled and made noise. A final vote in the Senate would sent the map to Republican Gov. Bill Lee, who called lawmakers into special session.

The redistricting effort in Tennessee is one of several rapidly advancing plans in Southern states as Republicans try to leverage a U.S. Supreme Court ruling that weakened the federal Voting Rights Act.

The court ruled that Louisiana relied too heavily on race when creating a second Black-majority House district as it attempted to comply with the federal law. The high court’s decision altered a decades-old understanding of the law, giving Republicans grounds to try to eliminate majority-Black districts that have elected Democrats.

Louisiana has postponed its congressional primary to give time for state lawmakers to craft a new House map. Legislation awaiting a final vote in Alabama also would upend the state’s congressional primaries if courts allow the state to change its U.S. House districts. In South Carolina, meanwhile, Republican lawmakers urged on by Trump have taken initial steps to add congressional redistricting to their agenda.

The states are the latest to join an already fierce national redistricting battle. Since Trump prodded Texas to redraw its U.S. House districts last year, eight states have adopted new congressional districts. From that, Republicans think they could gain as many as 13 seats while Democrats think they could gain up to 10. But some competitive races mean the parties may not get everything they sought in the November elections.

Tennessee Republicans act despite protests

As a first step to adopting new House districts, Tennessee lawmakers gave final approval Thursday to legislation that would repeal a state law prohibiting mid-decade redistricting. They then passed a bill that would reopen a candidate qualifying until May 15 to allow time for new people to enter the U.S. House primaries and existing candidates to switch districts or drop out.

The proposed House map would break up Tennessee’s lone Democratic-held district, centered on the majority-Black city of Memphis, creating a ripple effect of alterations to districts throughout the western and central parts of the state.

Republican House Speaker Cameron Sexton said the proposed districts were drawn based on population and politics, not racial data.

But Democrats dismissed such assertions.

“These maps are racist tools of white supremacy at the behest of the most powerful white supremacist in the United States of America, Donald J. Trump,” said state Rep. Justin Pearson, a Black Democrat from Memphis who is running for the U.S. House.

State Rep. Torrey Harris, another Black Democrat from Memphis, said he would lose part of his voting power as a result of the congressional districts.

“You cannot celebrate democracy while carving out Black communities,” he said. “We all know it, whether we say it or not, that this map impacts Black people negatively.”

Democrats noted that the state Supreme Court in April 2022 rejected a challenge to the current congressional map, finding it was too close to the election to make changes. This year, there’s even less time before the Aug. 6 primary, raising the potential of confusion for both candidates and voters, Democrats said.

A plan for a new primary advances in Alabama

Protesters watching an Alabama legislative committee Thursday erupted in shouts of “shame” as Republican lawmakers advanced legislation to authorize special congressional primaries if the state can put a new congressional map in place for the November midterms.

In the wake of the Supreme Court decision arising from Louisiana, Alabama is seeking to overturn a court injunction that created a second U.S. House district with a substantial percentage of Black voters. That map led to the 2024 election of Rep. Shomari Figures, a Black Democrat. Republicans want instead to use a 2023 map drawn by state lawmakers that would give the GOP an opportunity to reclaim Figures’ district.

If a court grants Alabama’s request, the legislation under consideration would ignore the May 19 primary results for congressional seats and direct the governor to schedule a new primary under the revised districts.

The House passed the legislation on a party-line vote Thursday after four hours of fiery debate. A final vote in the Senate is expected Friday.

South Carolina may add redistricting to its agenda

The South Carolina Senate could take up a resolution Thursday giving lawmakers permission to return later, after their regular work ends, to redraw congressional districts that could eliminate the state’s only Democratic-held district. The proposal, which passed the House on Wednesday, needs a two-thirds vote in both chambers.

Republican House leaders said after the vote that they plan to introduce a new map Thursday and hold committee meetings on Friday. But during debate Wednesday, Republicans fended off specific questions from Democrats, including why they were willing to stop the June 9 U.S. House primary elections well after candidates filed and how much a rescheduled primary could cost.

Democratic Rep. Justin Bamberg said he felt sorry for Republicans who, he said, were giving up their principles to follow the whims of Trump.

“The president of the United States is a very powerful man. Wields a heavy, heavy thumb — Truth Social, X, Meta, Instagram. To be honest I don’t envy our Republican colleagues,” Bamberg said.

Loller, Chandler, Collins and Lieb write for the Associated Press. Chandler reported from Montgomery, Ala.; Collins from Columbia, S.C.; and Lieb from Jefferson City, Mo. AP reporter Kristin M. Hall contributed to this report.

WASHINGTON — Federal prosecutors made an unannounced visit this week to a construction site at Federal Reserve headquarters that is the focus of an investigation into a $2.5-billion renovation project, according to two people familiar with the visit.

Two prosecutors and an investigator from U.S. Atty. Jeanine Pirro’s office were turned away on Tuesday by a building contractor and referred to Fed attorneys, one of the people said. The two people familiar with the visit spoke on condition of anonymity because they weren’t authorized to publicly discuss an ongoing investigation.

The visit underscores that the Trump administration is not backing down from its investigation of the Fed and its chair, Jerome Powell, even though the probe has delayed the confirmation of a new chair nominated by President Trump. The investigation is focused on cost overruns and brief testimony about the project last summer by Powell. Trump confirmed in an interview that aired Wednesday on Fox Business that he wants to continue the probe.

Last month, during a closed-door hearing before a federal judge, a top deputy from Pirro’s office conceded that they hadn’t found any evidence of a crime in their investigation of the headquarters project.

Robert Hur, an attorney for the Federal Reserve board of governors, sent an email to Pirro’s prosecutors about their visit and their request for a “tour” to “check on progress” at the construction site. Hur’s email, which the Associated Press has viewed, noted that U.S. District Judge James Boasberg concluded that their interest in the Federal Reserve’s renovation project was “pretextual.”

“Should you wish to challenge that finding, the courts provide an avenue for you; it is not appropriate for you to try to circumvent it,” Hur wrote.

Republican Tillis is key vote

Sen. Thom Tillis, a North Carolina Republican who is a key member of the Senate Banking Committee, has vowed to vote against Kevin Warsh, Trump’s nominee to replace Powell as Fed chair, until the investigation is dropped. With the committee closely divided on partisan lines, Tillis’ opposition is enough to block Warsh.

The Banking panel said Tuesday that it will hold a hearing on Warsh’s nomination April 21. Powell’s term as Fed chair ends May 15, but Powell said last month he would remain as chair until a replacement is named.

Powell is serving a separate term as a member of the Fed’s governing board that lasts until January 2028. Chairs typically leave their posts as governor when their terms as chair end, but they can remain on the board if they choose.

Last month, Powell said, “I have no intention of leaving the Board until the investigation is well and truly over, with transparency and finality.” If he remains in his seat, even after Warsh is confirmed, it would deny Trump the oppotunity to fill a seat on the seven-member board.

Late Tuesday, Tillis posted a link on social media to the Wall Street Journal’s article on the visit below an image of the Three Stooges and wrote, “The U.S. Attorney’s Office for D.C. at the crime scene.”

Investigation centers on building renovations

The investigation by Pirro’s office centers on an appearance by Powell before the Senate Banking Committee last June, when he was asked about cost overruns on the Fed’s extensive building renovations. The most recent estimates from the Fed suggest the current estimated cost of $2.5 billion is about $600 million higher than a 2022 estimate of $1.9 billion.

“It is probably corrupt, but what it really is, is incompetent,” Trump said on Fox Business. “Don’t you think we have to find out what happened there?”

The president’s support for the investigation threatens a time frame set out by Sen. Tim Scott, a South Carolina Republican who chairs the Banking Committee. Scott said Tuesday on Fox Business that he believed the investigation would be “wrapped up in the next few weeks,” allowing Warsh to be confirmed soon after.

Threat to fire Powell

News of the unannounced visit by prosecutors comes as Trump has again threatened to fire Powell, if the Federal Reserve chair decides to stay on the central bank’s governing board after his term as chair expires next month.

“Well then I’ll have to fire him, OK?” Trump said when reminded that Powell has said he won’t leave the Fed while the Justice Department investigates a $2.5-billion renovation project at the bank. Powell has also said he will remain as chair of the Fed’s rate-setting committee until a replacement is confirmed by the Senate, following the precedent of previous chairs.

Trump has for months wanted to remove Powell as chair of the Fed, saying he has been too slow in orchestrating interest rate cuts that would give the U.S. economy a quick boost. Powell has said the investigation is a pretext to undermine the Fed’s independence to set rates.

Supreme Court weighing another Trump removal

Trump’s threat to fire Powell comes as the Supreme Court is weighing the president’s effort to remove another central bank governor, Lisa Cook. Lower courts have so far allowed Cook to remain in her job while her legal challenge to the firing continues. The Supreme Court also seemed likely to keep her on the Fed when the court heard arguments in January. A decision could come any time.

The issue in Cook’s case is whether allegations of mortgage fraud, which she has denied, is a sufficient reason to fire her or a mere pretext masking Trump’s desire to exert more control over U.S. interest rate policy.

The Supreme Court has allowed the firings of the heads of other governmental agencies at the president’s discretion, with no claim that they did anything wrong, while also signaling that it is approaching the independence of the nation’s central bank more cautiously, calling the Fed “a uniquely structured, quasi-private entity.”

Kunzelman and Rugaber write for the Associated Press. AP Writer Mark Sherman contributed to this report.