In the ABC News interview, Comey offered a scathing judgment about whether Trump is qualified to serve as president, saying that he believes Trump is "morally unfit" to serve in the nation's highest office.
James Comey, who was sacked by Trump previous year amid an FBI investigation of possible ties between Russia's meddling in the United States election and Trump's 2016 campaign, made his comments in an interview with ABC News on Sunday, saying Trump may be vulnerable to blackmail by Russian Federation.
The long ranging interview touched on several topics, including the Hillary Clinton email scandal, his start at the Federal Bureau of Investigation and the alleged dossier of information that may involve compromising material on Trump.
"I think it's possible".
Comey also said that when Trump said, "I hope you can let it go" during a subsequent meeting at which an investigation into Michael Flynn, Trump's first national security adviser, was raised, he took that as a "direction", which he said "certainly (is) some evidence of obstruction of justice".
U.S. President Donald Trump's denunciation of former FBI Director James Comey as a "slime ball" on Friday triggered a 60,000 percent jump in look-ups for the word on Merriam-Webster's website, the dictionary publisher said.
"Trump, 71, has said the" badly reviewed book" raises "big questions".
Comey's memoir "A Higher Loyalty: Truth, Lies, and Leadership", is to be released next week.
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Comey has faced harsh criticism from both Republicans and Democrats and his book gives him a chance to defend his actions, according to CNN.
The FBI director, who until his firing last May led an investigation into possible ties between Russian Federation and the Trump campaign, acknowledged that it was "stunning" to think that Russian Federation could have damaging information about an American president. "I was dreading it", Comey said, noting he'd be "an unhappy F.B.I. director, but in a way proud of the organization and in my role in trying to protect it".
He seized on an excerpt shown Saturday in which Comey said his belief that Clinton would beat Trump in the 2016 presidential election was probably a factor in his decision to disclose the investigation into her emails. "They blame him for her loss".
Last summer, Senate Judiciary Chairman Chuck Grassley and Sen.
Trump has denied having asked Comey for his loyalty.
Comey's firing came as the Federal Bureau of Investigation was probing possible connections between Trump's 2016 presidential campaign and Russia's meddling in the USA election.
Mr Comey now says in the weeks leading up to the 2016 election he, like everyone else, were working on the assumption that Mrs Clinton would win, and that by not announcing the reopened investigation so close to election day, he could delegitimise the result - which was Russia's ultimate aim.
She says she rose above politics throughout the email investigation, and never discussed it with anyone from the Clinton campaign or the Democratic National Committee. Flynn has since pleaded guilty to lying to the FBI about his contacts with Russia's ambassador and is now cooperating with the Mueller investigation.