President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's attorney Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE tore into CNN's Chris Cuomo Chris CuomoCNN's Don Lemon: 'Blow up the entire system' remark taken out of context CNN's Lemon: 'We're going to have to blow up the entire system' if Democrats win back White House, Senate Giuliani criticizes NYC leadership: 'They're killing this city' MORE during an interview Thursday night, calling the CNN host a "sellout" during a contentious exchange over Giuliani's efforts to get Ukraine to investigate former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE.

Giuliani accused Cuomo of being "totally biased" during a heated back-and-forth after the Trump lawyer denied that he had asked Ukraine to look into Biden before seconds later acknowledging that "of course" he had asked for such a review.

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"You're trying to distort what I'm saying because you're totally biased," Giuliani argued over pushback from the CNN host. "You are, Chris. It's sad ... It's sad to watch what's happened to you. It's sad!"

"You're a total sellout," the former New York City mayor added. "These are crimes of major proportions. And because they're Democrats, you won't cover it."

Cuomo to Rudy Giuliani: "Did you ask the Ukraine to investigate Joe Biden?"



Rudy: "No, I actually didn't"



[20 seconds later]



Cuomo: "So you did ask Ukraine to look into Joe Biden?"



Rudy: "Of course I did!" pic.twitter.com/cuwTCvTcRn — Justin Baragona (@justinbaragona) September 20, 2019

Giuliani's appearance on CNN Thursday came amid growing scrutiny this week over a whistleblower complaint reportedly related to Trump's discussions with a foreign leader that was filed by a member of the U.S. intelligence community.

The Washington Post reported Thursday night that the complaint related to Ukraine.

Giuliani questioned the motivations of the person who filed the complaint, saying they would be investigated by the intelligence community's inspector general.

The conversation eventually returned to Biden, with the host questioning whether Giuliani could produce documents he had referenced to back up his allegations.

"Why would I give the enemy the documents? ... You are not fair and impartial. You are totally biased and your network is a creature of a Democratic National Committee,” Giuliani claimed.

During the interview, Giuliani acknowledged pressing for an investigation into Biden, the Democratic presidential front-runner, over what he alleged was an effort by the former vice president to pressure Ukraine into firing a prosecutor who was investigating a company of which Biden's son Hunter Biden was a board member.

Biden had in 2016 threatened to withhold $1 billion in U.S. loan guarantees unless the Ukrainian government removed the top prosecutor, The New York Times reported. The prosecutor was later voted out amid corruption allegations.