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

Former FBI Director James ComeyJames Brien ComeyDershowitz: Trump's lawyers could force Rosenstein to recuse himself from Mueller probe New York Times defends bombshell Rosenstein report Donald Trump’s Rosenstein dilemma MORE said late Thursday that claims by President TrumpDonald John TrumpSunday shows preview: Trump sells U.N. reorganizing and Kavanaugh allegations dominate Ex-Trump staffer out at CNN amid “false and defamatory accusations” Democrats opposed to Pelosi lack challenger to topple her 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 PapadopoulosFlynn sentencing move spurs questions about duration of Mueller probe Time for sunshine on Trump-Russia investigation Trump to declassify controversial text messages, documents related to Russia probe 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 ClintonPompeo: 'We've not been successful' in changing US-Russia relations Michael Moore ties Obama to Trump's win in Michigan in 2016 The Memo: Could Kavanaugh furor spark another ‘year of the woman’? 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."