The answers to such questions could prove critical for Comey, as the inspector general's office is expected to release a significant report in the coming weeks on how the FBI handled politically sensitive investigations related to Trump and his 2016 presidential rival, Hillary Clinton. Trump later acknowledged that he had taken the investigation into Russian meddling in the 2016 election into consideration when he dismissed Comey. However, Flynn interrupted Trump to inform him that another world leader had called first.
Days after laying out that thin pretext, Trump contradicted himself, saying on national TV that when he made a decision to send Comey walking, he was thinking about "this Russian Federation thing".
Earlier this month, White House spokesperson Sarah Sanders said the president "certainly believes he has the power" to fire Mueller.
In a Senate hearing in June, Mr Comey told Congress, "I knew there might come a day when I would need a record of what had happened, not just to defend myself, but to defend the Federal Bureau of Investigation and our integrity as an institution and the independence of our investigative function".
CNN obtained the documents, which offer a staggering insider account, after they were sent to Congress by the Justice Department on Thursday in response to requests from three GOP House committees on Capitol Hill. The department released Mr Boyd's letter publicly but did not release the memos.
The Jan. 28, 2017, memo released Thursday had Putin's name blacked out, but the head of state's identity was confirmed by the administration official, who spoke on the condition of anonymity to discuss sensitive information.
It's not clear what in the memos led the president to reach the conclusion.
TAPPER: It's- uh, interesting that you won't go as far as to say that Hillary Clinton would be - the nation would be better off if Hillary were president because you have called for the nation to respond to the challenge of Trump in your view by voting, presumably by voting against what he represents. "Will the Witch Hunt continue?"
She writes: "The central themes that Comey returns to throughout this impassioned book are the toxic consequences of lying; and the corrosive effects of choosing loyalty to an individual over truth and the rule of law".
Last week Comey compared Trump to a mob boss, and described the President as "morally unfit" for his office. "He had jeopardized the Department of Justice's credibility in the investigation", writes Comey.
"But The Wall Street Journal has reported that there were only two memos that Comey gave to his friend that had any classified information", Mulroy said.
Now, the Post, as good as it is, has always had a tendency toward the smartacre, so it is not perhaps surprising that Michiko Kakutani's review for The New York Times comes across as more serious.