"It gets chaotic", Comey said, likening the scene to one written in "a movie script".
Former FBI Director James Comey's book, A Higher Loyalty, "drops" (as they say in the publishing industry) this week - specifically, tomorrow, April 17. "This president is not able to do that", Comey added.
Trump's firing of Comey set off a scramble at the Justice Department that led to the appointment of Mueller as special counsel overseeing the Russia investigation.
Information for this article was contributed by Catherine Lucey and Eric Tucker of The Associated Press; by Ros Krasny and Jennifer Jacobs of Bloomberg News; and by Matt Zapotosky, Devlin Barrett, Josh Dawsey, Mike DeBonis, Greg Jaffe and Carolyn Johnson of The Washington Post.
"The loyalty oaths, the boss as the dominant center of everything, it's all about, 'How do you serve the boss, what's in the boss' interests?' It's the family, the family, the family, the family", he said.
He also said it was possible Russia was holding something over Mr Trump. That decision has many, reportedly including special counsel Robert Mueller, questioning whether Trump obstructed justice.
According to the transcript and video of the interview posted online, Comey describes warning Trump about what may be the most infamous allegation in a dossier of claims involving Trump and Russia, parts of which remain unverified.
Comey told ABC News that the title of the book came from that "bizarre conversation" he had with Trump at the White House in January 2017, shortly after his inauguration."He asked for my loyalty personally as the F.B.I".
But Comey noted that while "there was never a resolution of the case", the positive outcome was that "that night, the Ramsey rapist attacks stopped".
The former FBI boss acknowledged he had grave misgivings about the Trump presidency even before it began. Trump said in one of a series of tweets fired off Sunday before the interview. "I wish I wasn't saying it, but it's the truth". So far, 19 people have been charged in the investigation. 3 presidents are in my book: 2 help illustrate the values at the heart of ethical leadership; 1 serves as a counterpoint. 'I think he's morally unfit to be president, ' Comey told Stephanopoulos.
The President and his allies have launched a forceful counterattack.
Comey said Trump is "a stain" on everyone who comes into contact with him, a man who treats women "like they're pieces of meat" and "morally unfit to be president".
Democrats and liberals overwhelmingly find Comey more believable; independents and moderates side with Comey as well, by 48-29 and 57-22 per cent, respectively.
The former FBI chief appeared to hold nothing back when he got in front of the cameras.
Comey declined to answer when asked whether he believed Trump should be impeached, calling it a "question of law and fact and politics". Comey announced in July 2016 that he would not recommend charges against Clinton, but stated publicly that Clinton and her aides had been "extremely careless" in handling classified information. Clinton herself has pointed to Comey's actions in explaining her presidential election loss. And I was in my room when a gunman kicked in the front door of the house. He believes Americans are "duty bound" to "go to the voting booth and vote their values".
If you thought the disdain between Donald Trump and former FBI director James Comey would fizzle away, Sunday surely allayed any prospect of a truce.
"I never asked Comey for Personal Loyalty. Because we'll be custodians of the security of this country.' There was none of that".
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