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

Former FBI Director James ComeyJames Brien ComeyComey says he has a 'fantasy' about deleting his Twitter account after end of Trump term We need answers to questions mainstream media won't ask about Democrats Trump 'constantly' discusses using polygraphs to stem leaks: report MORE said late Thursday that claims by President TrumpDonald John TrumpWarren defends, Buttigieg attacks in debate that shrank the field Five takeaways from the Democratic debate in Ohio Democrats debate in Ohio: Who came out on top? 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 PapadopoulosWe need answers to questions mainstream media won't ask about Democrats Trump asked Australian leader to help look into Mueller probe's origins: report US attorney recommends moving forward with charges against McCabe after DOJ rejects his appeal 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 ClintonWarren defends, Buttigieg attacks in debate that shrank the field Democrats fear Ohio slipping further away in 2020 Poll: Warren leads Biden in Maine by 12 points 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."