Former FBI Deputy Director Andrew McCabeAndrew George McCabeTrump shakes up Justice Department, intelligence community Trump allies assembled lists of officials considered disloyal to president: report Bill Barr is trying his best to be Trump's Roy Cohn MORE accused President TrumpDonald John TrumpCuomo grilled by brother about running for president: 'No. no' Maxine Waters unleashes over Trump COVID-19 response: 'Stop congratulating yourself! You're a failure' Meadows resigns from Congress, heads to White House MORE of acting like a mob boss and releasing a “strain of insanity,” according to a copy of his new book obtained by The Guardian.

McCabe alleges in the book that Trump and White House Counsel Don McGahn offered him protection in exchange for loyalty.

“The president and his men were trying to work me the way a criminal brigade would operate,” he wrote.

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McCabe became acting FBI director after Trump fired James ComeyJames Brien ComeyIs coronavirus the final Trump crisis? Full appeals court to rehear case over McGahn subpoena Tucker Carlson: Biden's 'fading intellect' an 'opportunity' for Democrats to control him MORE. He also said in the book, "The Threat: How the FBI Protects America in the Age of Terror and Trump," that Trump directed Deputy Attorney General Rod RosensteinRod RosensteinFull appeals court to rehear case over McGahn subpoena Graham starts closed-door depositions in FISA probe Attorney General Barr is in a mess — and has no one to blame but himself MORE to write a memo to justify the firing.

Rosenstein and the White House both publicly deny that Rosenstein was directed to write the memo, but, according to McCabe, Rosenstein privately said that Trump ordered him to write it.

“He said it wasn’t his idea. The president had ordered him to write the memo justifying the firing,” McCabe wrote.

Then-Attorney General Jeff SessionsJefferson (Jeff) Beauregard SessionsAlabama postpones March 31 GOP Senate runoff Biden has broken all the 'rules' of presidential primaries The Hill's Campaign Report: Defiant Sanders vows to stay in race MORE fired McCabe last year after a Justice Department inspector general report found that he lied about media disclosures. He denied the allegation.

The book is expected to go on sale this month.