Former FBI Deputy Director Andrew McCabeAndrew George McCabeA tale of two lies: Stone, McCabe and the danger of a double standard for justice Democrats fear rule of law crumbling under Trump Barr back on the hot seat MORE accused President TrumpDonald John TrumpCensus Bureau spends millions on ad campaign to mitigate fears on excluded citizenship question Bloomberg campaign: Primary is two-way race with Sanders Democratic senator meets with Iranian foreign minister 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 ComeyTrump commutes sentence of ex-Illinois Gov. Blagojevich A tale of two lies: Stone, McCabe and the danger of a double standard for justice DOJ attorney looking into whether CIA withheld info during start of Russia probe: NYT 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 RosensteinGraham requests interviews with DOJ, FBI officials as part of probe into Russia investigation DOJ won't charge former FBI Deputy Director McCabe Rosenstein says he authorized release of Strzok-Page texts 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 SessionsThe Hill's Morning Report - Sanders on the rise as Nevada debate looms NSA whistleblower petitions Trump for clemency Alabama Senate contender hits Sessions in new ad: 'Hillary still ain't in jail' 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.