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Giuliani attacks Cohen over Trump Tower report: He's a 'pathological liar'

President TrumpDonald John TrumpKey takeaways from the Arizona Senate debate Major Hollywood talent firm considering rejecting Saudi investment money: report Mattis says he thought 'nothing at all' about Trump saying he may leave administration MORE’s attorney Rudy Giuliani lashed out at Trump’s former longtime personal lawyer Michael Cohen on Thursday night, questioning his credibility and calling him a "pathological liar."

Giuliani ripped into Cohen during an appearance on CNN's "Cuomo Prime Time" after the network reported on Cohen's claims that Trump had advance knowledge of a 2016 Trump Tower meeting between Trump campaign officials and a Russian lawyer.

“He’s been lying all week, he’s been lying for years,” Giuliani said of Cohen.

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Earlier this week, CNN aired audio from a 2016 conversation between Cohen and Trump about a payment tied to a former Playboy model alleging an affair with Trump. Cohen had secretly recorded the conversation, which is one of several tapes currently in the possession of federal investigators.

“The tapes that we have demonstrate any number of very serious lies back a year and a half ago, including his fooling people, hiding tape recordings, telling them they aren’t recorded, lying to their face, breaking faith with them,” Giuliani said of Cohen on CNN. “I don’t see how he has any credibility.”

CNN reported minutes earlier that Cohen is willing to tell special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE that Trump approved the Trump Tower meeting between Russian lawyer Natalia Veselnitskaya and Donald Trump Jr.Donald (Don) John TrumpDems fear party is headed to gutter from Avenatti’s sledgehammer approach Trump Jr. to stump in Indiana for Pence’s brother and governor hopeful Donald Trump Jr. blasts Beto O’Rourke: ‘Irish guy pretending to be Hispanic’ MORE, among other Trump campaign officials.

Trump, Trump Jr. and others have all denied that the president knew about the meeting before The New York Times revealed the meeting's existence in July 2017.

“There’s nobody that I know that knows him who hasn’t warned me that if he’s backed up against a wall he’ll lie like crazy, because he’s lied all his life,” Giuliani said of Cohen on Thursday.

He added that Cohen is “the kind of witness who can really destroy a whole case.”

“A person who is found to be an incredible liar, he’s got a tremendous motive to lie now because he’s got nothing to give, says it, all of a sudden, at the 11th hour. I don’t think anybody believes that,” Giuliani said.

Giuliani also said he has spoken with the other people in the room during the meeting that Cohen was referring to, claiming that they can corroborate that Trump Jr. did not discuss the Trump Tower meeting with his father.

Cohen is under federal investigation by prosecutors in New York, and reportedly believes telling Mueller his account of the meeting with Trump will alleviate some of the pressure from the probe, CNN reported.