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 personal 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 threatened to sue another guest for libel during a heated Fox News segment Tuesday night regarding the former New York mayor's communications with Ukrainian officials.

“I’d like to say to you, Mr. Hahn, I should sue you for libel. You usually say incredibly stupid things,” Giuliani said on "The Ingraham Angle" after Democratic strategist Chris Hahn accused Giuliani of being libelous toward 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 and his son Hunter Biden in "making things up" regarding his assertion that he was directed by the State Department to gather evidence on Democratic 2020 front-runner.

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“You’re a public figure, so then you know the libel law,” Hahn, a former aide to Senate Minority Leader Charles Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (D-N.Y.), said.

“Shut up, moron! Shut up! Shut up! You don’t know what you’re talking about, idiot!" Giuliani shot back.

“I do,” Hahn replied.

“No you don’t, you just lied!” Giuliani retorted.

“OK, guys, you’ve got to stop,” Ingraham insisted as the two men continued to argue.

Earlier in the segment, Giuliani said his claim regarding the request by the State Department was documented.

“Here’s why I was asked by the State Department — it’s all documented — they called me to facilitate a meeting between the president and Mr. Zelensky to help do that,” Giuliani said, referring to Ukrainian President Volodymyr Zelensky. “I met with the representative of Mr. Zelensky. We never discussed any kind of pressure about a criminal case, we never discussed any kind of quid pro quo or pressure.”

Giuliani has been active on the media front for the past week as Ukraine has become the central focus in Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE's (D-Calif.) formal impeachment inquiry into Trump, which was announced on Tuesday.

On Tuesday, Trump authorized the release of a transcript of his conversation two months ago with Zelensky.

"I am currently at the United Nations representing our Country, but have authorized the release tomorrow of the complete, fully declassified and unredacted transcript of my phone conversation with President Zelensky of Ukraine," Trump tweeted Tuesday afternoon.

I am currently at the United Nations representing our Country, but have authorized the release tomorrow of the complete, fully declassified and unredacted transcript of my phone conversation with President Zelensky of Ukraine.... — Donald J. Trump (@realDonaldTrump) September 24, 2019

The president is scheduled to meet with Zelensky at the United Nations General Assembly on Wednesday in New York.