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

Former FBI Director James ComeyJames Brien ComeyThe road not taken: Another FBI failure involving the Clintons surfaces Sarah Huckabee Sanders becomes Fox News contributor 3 real problems Republicans need to address to win in 2020 MORE said late Thursday that claims by President TrumpDonald John TrumpThe Hill's Campaign Report: Democratic field begins to shrink ahead of critical stretch To ward off recession, Trump should keep his mouth and smartphone shut Trump: 'Who is our bigger enemy,' Fed chief or Chinese leader? 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 Papadopoulos10 declassified Russia collusion revelations that could rock Washington this fall Flynn, Papadopoulos to speak at event preparing 'social media warriors' for 'digital civil war' Judge dismisses DNC lawsuit against Trump campaign, Russia over election interference 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 ClintonThe road not taken: Another FBI failure involving the Clintons surfaces DHS cyber agency to prioritize election security, Chinese threats ABC chose a debate moderator who hates Trump 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."