Former FBI Director James Comey has blasted US President Donald Trump as unethical and "untethered to truth" in a forthcoming book and calls his leadership of the country "ego driven and about personal loyalty".
Comey reveals new details about his interactions with Trump and his own decision-making in handling the Hillary Clinton email investigation before the 2016 election.
He casts Trump as a mafia boss-like figure who sought to blur the line between law enforcement and politics and tried to pressure him regarding his investigation into Russian election interference.
The book adheres closely to Comey's public testimony and written statements about his contacts with the president during the early days of the administration and his growing concern about the president's integrity.
It also includes strikingly personal jabs at Trump that appear likely to irritate the president.
The 6-foot-8 Comey describes Trump as shorter than he expected with a "too long" tie and "bright white half-moons" under his eyes that he suggests came from tanning goggles. He also says he made a conscious effort to check the president's hand size, saying it was "smaller than mine, but did not seem unusually so."
The book, "A Higher Loyalty," is to be released next week.
Trump fired 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 Russia investigation.
Mueller's probe has expanded to include whether Trump obstructed justice by firing Comey, an idea the president denies. Trump has assailed Comey as a "showboat" and a "liar."
Comey's account lands at a particularly sensitive moment for Trump and the White House. Officials there describe Trump as enraged over a recent FBI raid of his personal lawyer's home and office, raising the prospect that he could fire Deputy Attorney General Rod Rosenstein, who appointed Mueller, or try to shut down the probe on his own.
Comey provides new details of his firing. He also writes extensively about his first meeting with Trump after his election.