Excerpts of the interview with ABC News already have been aired, as have reviews of Comey's new memoir "A Higher Loyalty: Truth, Lies and Leadership", which likens Trump to a dishonest, ego-driven mob boss who demanded a pledge of loyalty from his Federal Bureau of Investigation chief.
Mr Comey also reveals new details about his interactions with Mr Trump and his own decision-making in handling the Hillary Clinton email investigation before the 2016 election.
Comey's interview with George Stephanopoulos is being shown on a special edition of ABC's "20/20" at 10 p.m. ET Sunday.
Comey, who ran the Federal Bureau of Investigations for nearly four years, portrays the president in the book as a liar, dumb and rude, and he compares elements of Trump's behavior to that of a Mafia boss. Asked by NBC's Chuck Todd if he felt Comey was a "man of integrity", Ryan stated that what he knows of Comey would indicate he is. Trump said on Twitter. "His "memos" are self serving and FAKE!"
In yet another tweet, Trump accused Comey of throwing former U.S. Attorney General Loretta Lynch "under the bus". Comey asked a friend to give some of those memos to the New York Times, but the memos are not thought to contain classified material.
It's the first sit-down, televised interview Comey has given since he was sacked by President Donald Trump previous year and the first in a series of interviews he will sit for in the coming weeks.
- Carlos Lozada (@CarlosLozadaWP) April 15, 2018Area president has locked himself into the powder room and is tweeting to the delight of area publisher.
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"I started to tell him about the allegation was that he had been involved with prostitutes in a hotel in Moscow in 2013", Comey says in the clip.
There's a lot going on in Trump's Sunday morning tweets, so let's back up a bit to see what he's trying to get at.
The president suggested that Lynch's 2016 conversation on a Phoenix airport tarmac with former President Bill Clinton revolved around a promised seat on the Supreme Court in exchange for backing off on any potential charges against Hillary Clinton for her use of a private server.
Mr Trump fired Mr Comey in May 2017, setting off a scramble at the Justice Department that led to the appointment of Robert Mueller as special counsel overseeing the Russian Federation investigation.
"In other words, he was making decisions based on the fact that he thought she was going to win, and he wanted a job. It is not okay", the Post quotes Comey as writing in the book, adding that he describes the Trump presidency as a "forest fire".
Trump has said he fired Comey because of his handling of the FBI's investigation into Clinton's email practices. The president appears to be referring to passages in A Higher Loyalty in which Comey wrote that he had a "tortured half-in, half-out approach" to the investigation into Clinton's emails.