Former President Trump’s top rivals in the Republican Party lined up behind the 2024 nominee on Tuesday, promising he would “make America safe again” from violent criminals and dangerous undocumented immigrants who they suggested are invading the nation via an “open” southern border.

After questioning his abilities and integrity during the primaries, they gave full-throated backing to a man they once loudly reviled, saying that unifying behind their former foe was crucial for the nation’s future. Trump, who entered the convention hall to thunderous applause, looked on approvingly as his former opponents urged voters to return him to the White House.

“For more than a year, I said a vote for Joe Biden is a vote for President Kamala Harris,” said Trump’s former ambassador to the United Nations, Nikki Haley. “After seeing the debate, everyone knows it’s true. If we have four more years of Biden or a single day of Harris, our country will be badly worse off. For the sake of our nation, we have to go with Donald Trump.”

But Haley said her message was aimed at voters who may have qualms about the former president.

Former Ambassador Nikki Haley speaks during the Republican National Convention on Tuesday.

(Robert Gauthier / Los Angeles Times)

“We should acknowledge there are some Americans who don’t agree with Donald Trump 100% of the time. I happen to know some,” said Haley, whom Trump nicknamed “Birdbrain” during their 2024 primary contest. “My message to them is simple. You don’t have to agree with Trump 100% of the time to vote for him. Take it from me, I haven’t always agreed with President Trump, but we agree more often than we disagree.”

Trump and his running mate, Ohio Sen. J.D. Vance, entered the Milwaukee arena shortly before speeches by Haley, Florida Gov. Ron DeSantis, whom he bested in a testy 2024 GOP primary, and Texas Sen. Ted Cruz, one of his opponents in the 2016 election.

“Let’s send Joe Biden back to his basement and let’s send Donald Trump back to the White House,” said DeSantis, whom Trump nicknamed “Ron DeSanctimonious.” “Our border was safer under the Trump administration and our country was respected when Donald Trump was our commander in chief. Joe Biden has failed this nation.”

Florida Gov. Ron DeSantis speaks during the Republican National Convention on Tuesday.

(Robert Gauthier / Los Angeles Times)

Haley and DeSantis apparently learned a lesson from Cruz — aka “Lyin’ Ted” — whose failure to endorse Trump after losing to him in the 2016 GOP primary earned him boos at that year’s convention and some enmity from Trump loyalists. He has since fallen back in line with the man who suggested his father was potentially involved in the assassination of President John F. Kennedy.

The praise of Trump was interspersed with speeches about crime and immigration, and some of the most moving and powerful moments of the night came from families of crime victims.

On Tuesday, Cruz listed the names of Americans allegedly killed by people who are in the country illegally, including Kathryn Steinle, a 32-year-old woman who was shot in 2015 while strolling with her father on the Embarcadero in San Francisco.

“As a result of Joe Biden’s presidency, your family is less safe. Your children are less safe. The country is less safe. But here’s the good news: We can fix it. And when Donald Trump is president, we will fix it,” Cruz said. “We know this because he’s done it before.”

Tuesday night’s convention theme was “Make America Safe Again.”

Speaker after speaker, from politicians to law enforcement officials to people labeled “everyday Americans,” blamed crime in the U.S. in part on an “invasion” of criminals crossing into the country from the southern border with Mexico — though studies for years have shown immigrants are less likely to commit crimes here than natural-born U.S. citizens.

Kari Lake, a prominent 2020 election denier who lost a 2022 bid to become Arizona governor and is now running for the U.S. Senate, blamed “disastrous” Democratic policies for the surge in fentanyl and other opioid deaths in the country and along the southern border — which she said Trump would end.

Kari Lake speaks at the Republican National Convention on Tuesday.

(Jason Armond / Los Angeles Times)

Lake said President Biden and Democrats “have handed over control of my state, Arizona’s border, to the drug cartels,” and that “because of them, criminals and deadly drugs are pouring in and our children are dying.”

Anne Fundner, a mother from California, said her 15-year-old son, Weston, died from fentanyl in 2022 — which she blamed on the “open border” policies of Biden, Vice President Kamala Harris and Gov. Gavin Newsom.

“This was not an overdose, it was a poisoning. His whole future, everything we ever wanted for him, was ripped away in an instant — and Joe Biden does nothing,” Fundner said.

She said Trump must be elected to help end fentanyl’s scourge on American families like hers. “This fight is not for me. My son is gone,” she said. “This fight is for your children.”

Crime and homelessness are perennial campaign talking points among Republicans, often couched as the result of liberal policies in states such as California.

Republicans claim the title of the “law and order” party, which has been a particularly useful point of political redirection for Trump as he has faced multiple criminal investigations and been convicted of dozens of felonies in recent years.

Democrats dismiss the Republican criticisms as inaccurate or overblown. Cities like Los Angeles and San Francisco do struggle with crime and homelessness issues, Democrats say, but not to the extent Republicans suggest — and cities in red states struggle with similar issues.

Democrats also blasted Republicans for platforming individuals at the RNC who were involved in the Jan. 6, 2021, insurrection and siege on the U.S. Capitol.

Presidential candidate Donald Trump leaves the Republican National Convention on Tuesday.

(Robert Gauthier / Los Angeles Times)

Officer Michael Fanone, a Capitol Police officer who was injured in that attack, condemned the presence of insurrectionists at the convention.

“What happened on January 6th almost cost me my life and brought our democracy to the brink,” Fanone said in a statement. “This is a moment to come together and oppose those who call for violence in politics, but the RNC’s decision to give a platform to the same people who rioted against our democracy on January 6th does the opposite.”

Crime data vary across the country and within individual states.

However, the clearest trend in crime data in recent years nationwide, experts said, is that violent crime is down. Republicans often dismiss such data by saying they are fabricated or the result of lower reporting rates.