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 lawyer Rudy Giuliani is ripping Rep. Trey Gowdy Harold (Trey) Watson GowdySunday shows preview: Election integrity dominates as Nov. 3 nears Tim Scott invokes Breonna Taylor, George Floyd in Trump convention speech Sunday shows preview: Republicans gear up for national convention, USPS debate continues in Washington MORE (R-S.C.) for defending the FBI over Trump's spying claims.

"He's drinking the Kool-Aid," Giuliani told CNN on Thursday.

He also criticized Gowdy for not moving to prosecute Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE over Benghazi.

"I never understood what he did with Benghazi either. He really screwed that up. I don't know what he was doing," Giuliani said of Gowdy, who led the House investigation into Benghazi.

His comments come after Gowdy, the chairman of the House Oversight and Government Reform Committee, said he was "convinced" that the FBI acted appropriately in its use of a confidential informant to contact members of Trump's campaign.

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Giuliani went on to say that any meeting between Trump and special counsel 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 would be delayed until Trump's team was given more information on the FBI's use of Stefan Halper, the formerly confidential informant used by the agency in its investigation into alleged campaign ties to Russia.

"I will not accept a briefing. I only want to see the documents," he said.

"The only thing I can conclude is that the documents are going to show nothing connecting Donald Trump to the Russians. It's exculpatory, which is why they don't want to show us," he added.

Giuliani has frequently questioned the legitimacy of Mueller's investigation since joining Trump's legal team earlier this month.

The president has cast the FBI's use of an informant as evidence the bureau was "spying" on his campaign, which Trump and his allies have suggested without evidence was at the behest of then-President Obama.