Former FBI Deputy Director Andrew McCabeAndrew George McCabeMcCabe accuses Trump officials of withholding evidence in lawsuit over firing McCabe: Being accused of treason by Trump 'quite honestly terrifying' Horowitz report is damning for the FBI and unsettling for the rest of us MORE accused President TrumpDonald John TrumpWarren: Dershowitz presentation 'nonsensical,' 'could not follow it' Bolton told Barr he was concerned Trump did favors for autocrats: report Dershowitz: Bolton allegations would not constitute impeachable offense 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 ComeyCNN's Axelrod says impeachment didn't come up until 80 minutes into focus group NYT: Justice investigating alleged Comey leak of years-old classified info Bernie-Hillary echoes seen in Biden-Sanders primary fight 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 RosensteinRosenstein says he authorized release of Strzok-Page texts Journalist alleging Obama administration spied on her seeks to reopen case Rosenstein on his time in Trump administration: 'We got all the big issues right' 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 SessionsLawmaker wants Chinese news outlet to register as foreign agent Trump-aligned group launches ad campaign hitting Doug Jones on impeachment ICE subpoenas Denver law enforcement: report 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.