Comey: Trump's 'spygate' claims are made up

Former FBI Director James ComeyJames Brien ComeyThere was nothing remotely treasonous in Trump's performance with Putin Opinion: One FBI text message in Russia probe that should alarm every American Clapper: Intel officials showed Trump evidence of Putin's role in election meddling MORE said late Thursday that claims by President TrumpDonald John TrumpNFL freezes policy barring players from protesting during anthem McConnell spokesman on Putin visit: 'There is no invitation from Congress' Petition urges University of Virginia not to hire Marc Short MORE and his allies that the FBI improperly spied on his presidential campaign were made up.

"As best I can tell, it's made up. I don't know where he's getting that from, honestly," Comey told late-night host Conan O'Brien during an interview on Thursday night.

Asked if it was possible that there was a "spy" inserted into Trump's campaign by an intelligence agency, Comey said, "I don’t find it possible and I know it not to be true."

The president and his allies have said in recent days that the FBI used a top-secret informant to spy on the Trump campaign for political purposes. 

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The informant, who has been identified in media reports as Stefan Halper, an American professor, reportedly met with at least three Trump campaign advisers in 2016: George PapadopoulosGeorge Demetrios PapadopoulosWife of Papadopoulos interviews with House Intel Dems Mueller probing Roger Stone following Russian hacker indictment: report Hillicon Valley: Trump tries to quell Russia furor | Sparks fly at hearing on social media | First House Republican backs net neutrality bill | Meet the DNC's cyber guru | Sinclair defiant after merger setback MORE, Sam Clovis and Carter Page.

Trump has asserted that if the FBI did spy on his campaign it would be "bigger than Watergate," the scandal that prompted the resignation of former President Nixon.

Comey remarked Thursday that Trump has repeatedly declared something to be "the biggest scandal since Watergate."

"My guess is two weeks from now it'll be something different than this," Comey said.

No evidence has surfaced that suggests the Obama administration spied on Trump's campaign. 

Select lawmakers met with top Justice Department officials in two separate meetings on Thursday to discuss highly classified information about the FBI's use of the informant in 2016.

Trump abruptly fired Comey in May 2017, ostensibly for his handling of the FBI investigation into Hillary ClintonHillary Diane Rodham ClintonProminent Putin critic: If Trump turns me over, I'm dead Dems unveil slate of measures to ratchet up pressure on Russia Trump tweets old video of Clinton talking up 'a strong Russia' MORE's use of a private email server during her tenure as secretary of State. Since then, the president has repeatedly accused the former top cop of corruption.

In a tweet Thursday morning, Trump accused Comey of dealing significant damage to the FBI, calling him a "terrible and corrupt leader."

Comey has pushed back against Trump's broadsides during a series of public appearances and media interviews to promote his book, "A Higher Loyalty: Truth, Lies, and Leadership." In that title, Comey calls Trump an unethical and self-interested leader, who is "untethered to truth."