Former FBI Deputy Director Andrew McCabeAndrew George McCabeLisa Page joins MSNBC as legal analyst McCabe, Rosenstein spar over Russia probe New FBI document confirms the Trump campaign was investigated without justification MORE accused President TrumpDonald John TrumpMitt Romney invokes late father during the Civil Rights Movement amid protests White House wanted to deploy 10,000 troops to control protests: reports Zuckerberg, Chan-funded scientists pen 'letter of concern' over Trump, misinformation 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 ComeyGraham postpones Russia probe subpoena vote as tensions boil over GOP votes to give chairman authority to subpoena Obama officials GOP chairmen stake out turf in Obama-era probes 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 postpones Russia probe subpoena vote as tensions boil over GOP chairmen stake out turf in Obama-era probes McCabe, Rosenstein spar over Russia probe 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 SessionsMcCabe, Rosenstein spar over Russia probe Rosenstein takes fire from Republicans in heated testimony Rosenstein defends Mueller appointment, role on surveillance warrants 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.