Former FBI Deputy Director Andrew McCabeAndrew George McCabeRosenstein expected to leave DOJ next month: reports Harris calls idea of Trump trusting Putin over US intel ‘height of irresponsibility and shameful’ Warren: Officials have duty ‘to invoke 25th amendment’ if they think Trump is unfit MORE accused President TrumpDonald John TrumpRosenstein expected to leave DOJ next month: reports Allies wary of Shanahan's assurances with looming presence of Trump States file lawsuit seeking to block Trump's national emergency declaration 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.

McCabe became acting FBI director after Trump fired James ComeyJames Brien ComeyWarren: Officials have duty ‘to invoke 25th amendment’ if they think Trump is unfit McCabe: Trump 'may have' committed a crime in blocking Russia probe Trump: 'Disgraced' McCabe, Rosenstein look like they were planning 'very illegal act' 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 Jay RosensteinRosenstein expected to leave DOJ next month: reports Warren: Officials have duty ‘to invoke 25th amendment’ if they think Trump is unfit McCabe: Trump 'may have' committed a crime in blocking 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 SessionsRosenstein expected to leave DOJ next month: reports McCabe: Trump's 'relentless attack' on FBI prompted memoir Trump: 'Disgraced' McCabe, Rosenstein look like they were planning 'very illegal act' 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.