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U.S. President Donald Trump lashed out Friday at James Comey, calling the fired FBI boss a “proven LEAKER & LIAR,” a day after excerpts from Comey’s forthcoming tell-all book were released.

Comey’s book, titled A Higher Loyalty, sheds light on the time he spent inside the Trump administration, the details of his firing, and even goes so far as to compare the president to a mob boss.

“James Comey is a proven LEAKER & LIAR. Virtually everyone in Washington thought he should be fired for the terrible job he did-until he was, in fact, fired,” Trump tweeted. “He leaked CLASSIFIED information, for which he should be prosecuted. He lied to Congress under OATH. He is a weak and…..”

James Comey is a proven LEAKER & LIAR. Virtually everyone in Washington thought he should be fired for the terrible job he did-until he was, in fact, fired. He leaked CLASSIFIED information, for which he should be prosecuted. He lied to Congress under OATH. He is a weak and….. — Donald J. Trump (@realDonaldTrump) April 13, 2018

In the book, Comey compares Trump to a mafia don and calls his leadership of the country “ego-driven and about personal loyalty.”

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READ MORE: Comey memoir compares Trump to a mob boss — here are 5 things you need to know

He also reveals new details about his interactions with Trump and his own decision-making in handling the Hillary Clinton email investigation before the 2016 election.

WATCH: Kellyanne Conway calls James Comey’s new book a ‘revisionist view of history’

1:46 Kellyanne Conway calls James Comey’s new book a ‘revisionist view of history’ Kellyanne Conway calls James Comey’s new book a ‘revisionist view of history’

Comey casts Trump as a mobster-like figure who sought to blur the line between law enforcement and politics and tried to pressure him personally regarding his investigation into Russian election interference.

The president also called Comey an “untruthful slime ball,” adding that it was a “great honour” to fire the former FBI boss.

….untruthful slime ball who was, as time has proven, a terrible Director of the FBI. His handling of the Crooked Hillary Clinton case, and the events surrounding it, will go down as one of the worst “botch jobs” of history. It was my great honor to fire James Comey! — Donald J. Trump (@realDonaldTrump) April 13, 2018

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“…Untruthful slime ball who was, as time has proven, a terrible Director of the FBI. His handling of the Crooked Hillary Clinton case, and the events surrounding it, will go down as one of the worst ‘botch jobs’ of history. It was my great honor to fire James Comey!” the president tweeted.