In an interview on Wednesday on Fox News, Rudolph W. Giuliani, who recently joined President Trump’s legal team, said the president had repaid his personal lawyer for a $130,000 payment to the pornographic film actress Stephanie Clifford.

WASHINGTON — Rudolph W. Giuliani has been President Trump’s lawyer for only a few days, and already he is causing political explosions.

In one of his first interviews since joining Mr. Trump’s legal team, Mr. Giuliani appeared to briefly stun Sean Hannity of Fox News on Wednesday night by asserting that the president had reimbursed his personal lawyer for a $130,000 hush payment to a pornographic film actress — contradicting his client, the president.

[Read what Mr. Giuliani said here.]

“I want to clarify something,” Mr. Hannity said, offering a do-over to Mr. Giuliani, the former mayor of New York, failed presidential candidate and longtime friend of Mr. Trump’s. Instead of taking a mulligan, Mr. Giuliani repeated the assertion.

It was another high-profile, slightly off-kilter moment for Mr. Giuliani, who has lived a life full of them.

A veteran of the no-holds-barred world of New York tabloids that Mr. Trump also inhabited for decades, Mr. Giuliani was an early and vocal supporter of Mr. Trump’s presidential campaign. He was also a forceful critic of Hillary Clinton, a longtime political rival and Mr. Trump’s opponent in the 2016 presidential race.

For Mr. Giuliani, the embrace of Mr. Trump’s…