WASHINGTON, D.C. — First he renamed the British prime minister “Rashee Sanook.” Now Joe Biden has bestowed Rishi Sunak with a whole new job title which doesn’t actually exist in the U.K.

Welcoming the British premier to the White House for the first time Thursday, Biden immediately mixed up his honorifics, wrongly addressing Sunak as “Mr president.” The British PM smiled politely as Biden was swiftly forced to correct himself.

“Mr president?” Biden went on. “I’m just promoting you! Mr prime minister, it’s great to have you back.”

British constitutional experts are likely to take umbrage at the correction as much as the gaffe itself, given prime ministers are not considered to be the junior of presidents. Britain’s leader is, historically, the “prime,” or first and most important of the king’s ministers, also known as the first among equals.

Despite Biden’s misstep, the two men seemed relaxed in one another’s company as they met on Sunak’s second full day in the American capital.

Reporters were invited to witness the first 10 minutes of their discussion in the Oval Office, during which the pair discussed the “brutal invasion” of Ukraine, and the AI revolution sweeping the world.

They then spoke together in private for more than an hour, including 40 minutes one-on-one.

Biden gave reporters a thumbs-up as he declared the so-called “special relationship” between Britain and the U.S. in “real good shape.”

“Together, we are providing economic and humanitarian aid and security systems to Ukraine in their fight against a brutal invasion from Russia,” Biden said. “The global economy is undergoing the greatest transformation that has occurred since the industrial revolution.”

Before sitting down to business, the two men joked about some of their more characterful predecessors.

After Biden mentioned former PM Winston Churchill’s legendary wartime stay at the White House, when First Lady Eleanor Roosevelt is said to have blocked the then-prime minister from entering husband Franklin’s bedroom at 3 a.m., Sunak joked: “Sir, don’t worry — you won’t see me there, bothering you and the first lady.”

The British PM added: “It’s daunting to think of the conversations that our predecessors had in this room when they had to speak of wars that they fought together, peace won together, incredible change in the lives of our citizens.”