Rudy Giuliani, new hire to President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's legal team, took aim at former FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE on Thursday, calling him a "sensitive little baby" in an interview with The Washington Post.

The name-calling follows an explosive interview with Giuliani on Fox News's "Hannity" Wednesday night in which the former New York City mayor said Trump fired Comey because Comey wouldn’t tell Trump that he wasn’t a target of the FBI investigation into Russia's 2016 presidential election interference.

“He should be sensitive because he’s been caught lying over and over again,” Giuliani told the Post.

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Giuliani fired shots at the FBI during the one-hour Fox News segment, likening the New York bureau officers who raided the home and office of Trump's longtime personal lawyer, Michael Cohen, last month to "stormtroopers."

Comey, a former U.S. attorney in New York, lobbed back a strong defense of the bureau at Giuliani on Twitter.

“I know the New York FBI. There are no ‘stormtroopers’ there; just a group of people devoted to the rule of law and the truth. Our country would be better off if our leaders tried to be like them, rather than comparing them to Nazis," Comey wrote.

I know the New York FBI. There are no “stormtroopers” there; just a group of people devoted to the rule of law and the truth. Our country would be better off if our leaders tried to be like them, rather than comparing them to Nazis. — James Comey (@Comey) May 3, 2018

Giuliani also revealed Wednesday that Trump had compensated Cohen for his $130,000 payment to adult-film star Stormy Daniels to stay quiet about their alleged affair. Both Trump and White House press secretary Sarah Huckabee Sanders have previously denied that the president knew about the payment.

Giuliani joins Trump's legal team as lawyers from the special counsel communicate with White House attorneys about possible questions Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE could ask the president in a potential interview.