Comey, who was sacked by Republican President Donald Trump last May, is doing a series of media interviews that coincide with the release next week of his book, "A Higher Loyalty: Truth, Lies and Leadership".
"And I remember thinking", said Comey, "'How could your wife think there's a one percent chance you were with prostitutes peeing on each other in Moscow?'.What kind of marriage to what kind of man does your wife think [that] there's only a 99 percent chance you didn't do that?"
Trump fired off a series of tweets early ahead of an interview Comey did with United States television network the ABC that was set to air in full on Sunday evening.
"(Comey) is a weak and untruthful slime ball who was, as time has proven, a awful Director of the Federal Bureau of Investigation", the president tweeted.
In the final days of the campaign, Comey announced he was reopening the investigation into Clinton's private email server.
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In an interview aired Sunday on NBC News' "Meet The Press", the retiring Wisconsin Republican was grilled about the fired director's new book, "A Higher Loyalty", and was asked by host Chuck Todd if Comey was "a man of integrity".
Trump also denied Comey's repeated claims - both in his book and during his congressional testimony under oath past year - that Trump asked him to pledge him his loyalty. "I hope you can let this go".
Trump kicked off his tirade by referencing reports that Comey discloses in his book that Hillary Clinton's lead in 2016 election polling may have influenced Comey's handling of the FBI's investigation into Clinton's email server.
That is the game of Washington politicians and pundits, a world Comey disdains as a member of the elite guild of lawyer-bureaucrats from the Justice Department.
He compares Trump's insistence on a "silent circle of assent" to the code observed in the Mafia crime family that Comey helped bust as a young prosecutor in New York City.
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But a source said it was Cohen's "standard practice" to play recordings for the president that he'd made of other top advisers. The warrants also sought business records on Cohen's dealings in the taxi industry, the person said.
In a remarkable look back, Comey says he was deciding "in an environment where Hillary Clinton was sure to be the next president".
Asked how freakish that meeting with Trump was, Comey said: "Very weird". Ryan said, however, he had met Comey only a few times.
Even when working for major figures such as NY prosecutor (and later mayor) Rudy Giuliani, President George W. Bush or Vice President Dick Cheney, Comey begins with an air of respect but develops doubts and criticism as he discovers their feet of clay.
And once the dust settles in this high stakes poker game, you've gotta wonder who will be holding the Trump card?
Former Director of National Intelligence James Clapper told CNN he had "every confidence" in the accuracy of Comey's book.
Comey recalls Trump's reaction to dossier
Moscow has repeatedly denied that it interfered in the 2016 campaign in hopes of tilting the election in Trump's favor. She adds: "I think it's very clear that Comey has a credibility problem". "As far as I know, " Ryan replied.