Fox News anchor Chris Wallace and President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's lawyer Rudy Giuliani on Sunday found themselves in a heated exchange over the federal investigations into the president, with Wallace at one point telling Giuliani, "I’m asking you for the truth, sir."

Wallace and Giuliani wrangled over the former New York City mayor's talking points after a week in which Trump's ex-lawyer and "fixer" Michael Cohen was sentenced to three years in federal prison.

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Cohen, as well as federal prosecutors, has claimed he violated campaign finance laws at the direction of Trump. Cohen's violations stem in part from payments he made to two women, adult-film star Stormy Daniels and former Playboy model Karen McDougal, who were alleging 2006 affairs with Trump ahead of the 2016 election.

"According both to Cohen and to [National Enquirer publisher David] Pecker ... they say they were in a meeting with Donald Trump in the summer of 2016 in which they discussed the payment to Karen McDougal," Wallace said to Giuliani.

"It doesn’t matter," Giuliani replied. "We’re talking about something that doesn’t matter. Whether it happened or didn’t happen, it’s not illegal."

After some crosstalk, a visibly frustrated Wallace said, "You’re moving shells around on me. Either it happened or it didn’t happen."

"But that’s what lawyers do all the time," Giuliani said. "You argue in the alternative."

"I’m asking you for the truth, sir," Wallace replied.

After some more back-and-forth, Wallace jumped in to fact-check Giuliani's claim that the prosecutors alleging Trump's involvement in the payments were originally appointed to look at "collusion" and "obstruction."

"No no no no, sir, this was the Southern District of New York, they have nothing to do with collusion or obstruction of justice," Wallace said.

"They’re part of the Department of Justi—" Giuliani began to say. But Wallace interjected, saying, "I’m sure when you were the U.S. attorney for the Southern District, you didn’t take orders from somebody in Washington who had nothing to do with the Attorney General."

Giuliani was the U.S. Attorney for the Southern District of New York from 1983 until 1989. The prosecutors investigating Trump are with that office today.