Former FBI Deputy Director Andrew McCabeAndrew George McCabeMcCabe says it's 'absolutely' time to launch impeachment inquiry into Trump Feds gone wild: DOJ's stunning inability to prosecute its own bad actors Comey: Trump peddling 'dumb lies' MORE accused President TrumpDonald John TrumpEsper sidesteps question on whether he aligns more with Mattis or Trump Warren embraces Thiel label: 'Good' As tensions escalate, US must intensify pressure on Iran and the IAEA 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 ComeyHannity invites Ocasio-Cortez to join prime-time show for full hour The Hill's 12:30 Report: Acosta under fire over Epstein plea deal White House repeatedly blocks ex-aide from answering Judiciary panel questions 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 RosensteinFeds will not charge officer who killed Eric Garner The Hill's Morning Report — Trump retreats on census citizenship question Judiciary issues blitz of subpoenas for Kushner, Sessions, Trump associates 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 SessionsPress: Acosta, latest to walk the plank The Hill's Morning Report — Trump retreats on census citizenship question Alabama senator says Trump opposed to Sessions Senate bid 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.