In part, it recounts his role in investigating Russia's interference in the 2016 election and Democrat Hillary Clinton's use of a private email server that contained classified information, as well as Comey's private discussions with Trump before the president fired him last May.
Another passage questions Trump's morality, claiming, "this president is unethical and untethered to truth and institutional values".
That's not to suggest Mr. Comey isn't credible when it comes to Mr. Trump's shortcomings.
Comey details how Trump has been obsessed since his election with the more obscene details of the dossier that alleged Trump watched prostitutes in Moscow pee on each other in 2013 in a suite that Barack and Michelle Obama had once slept in.
Comey is promoting a new book - and incurring Trump's wrath as he does. In other words, he was making decisions based on the fact that he thought she was going to win, and he wanted a job.
Though Comey did not vote in the election, he said he privately supported Clinton, as did his wife and four daughters.
In recent days, the Internet has subjected James B. Comey's new book - "A Higher Loyalty: Truth, Lies, and Leadership" - to the traditional "5 Takeaways" treatment.
"And again, I don't know what that will be".
The investigation actually began when the FBI learned in July 2016 that George Papadopoulos, who was briefly an adviser to the Trump presidential campaign, "had been talking to someone in London about getting dirt that the Russians had on Hillary Clinton".
On the face of it then, Comey's book should pose quite a threat to the reputation of a President still embroiled in the Russian Federation investigation, and scandals involving women allegedly paid off to keep quiet about affairs. He said it was shortly after the inauguration when Comey was called into the Oval Office, which is where he says the president asked him to close the investigation into Former National Security Adviser Michael Flynn's ties to Russian Federation. Excerpts have already been widely reported, prompting President Donald Trump and his conservative allies to launch a furious attack on Comey.
Acknowledging that he found it "painful" to imagine that the move had an impact on the election, Comey argued that his main responsibility was to protect the public's faith in law enforcement, and in the Federal Bureau of Investigation as an independent institution. Trump wrote on Twitter, "I hardly even knew this guy". Trump declared on Sunday.
"I can't think of a more horrific way to fire someone who had given honorable service to his country", said Rogers, as Comey thinks what he was doing was right. Mueller's team is investigating Russian involvement in the 2016 US presidential election.
President Donald Trump and fired FBI Director James Comey are acting like "two kids in the schoolyard" fighting with each other, and the insults and accusations need to stop, former House Intelligence Chairman Mike Rogers, an ex-FBI investigator, said Monday. "I think he's morally unfit to be president".
Hours before the interview was shown, the president, who sacked Mr Comey previous year, unleashed a Twitter outburst that labelled him "slippery", suggested he should be put in jail and branded him "the WORST FBI Director in history, by far!" The president has called him a "liar and a leaker". "These are more words I never thought I'd utter about a president of the United States, but it's possible", Comey said.