President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's personal lawyer Rudy Giuliani on Tuesday said that White House staffers quoted as ripping the president in veteran journalist Bob Woodward’s forthcoming book should “go get another job.”

"If they said it, they should be questioning why they are there,” Giuliani told CNBC in an interview. “Why don't they go get another job? That's the kind of disloyalty that leads to you leaving, not staying and undermining the president.”

Giuliani also sought to cast doubt on the credibility of Woodward’s reporting, according to CNBC. The network noted that Woodward has defended his reporting, saying he "taped people for hundreds of hours."

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The Washington Post on Tuesday published excerpts from Woodward’s book, “Fear: Trump in the White House.” The book paints the picture of a dysfunctional White House and describes a number of conflicts between Trump and his aides.

The book claims that Trump called Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE “mentally retarded” and called former chief of staff Reince Priebus Reinhold (Reince) Richard PriebusLeaked audio shows Trump touted low Black voter turnout in 2016: report Meadows joins White House facing reelection challenges Trump names Mark Meadows as new chief of staff MORE “a little rat.” It also claims that current chief of staff John Kelly John Francis KellyMORE called Trump “unhinged” and an “idiot.”

Woodward writes in the book that Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE told associates that Trump has the knowledge of a “fifth- or sixth-grader” on the subject of North Korea, according to the Post.

Woodward wasn’t able to interview Trump for the book. The president told Woodward in a phone conversation last month that he would have sat for an interview but said nobody informed him that Woodward wanted to interview him.

The book — which Woodward said is based on hundreds of hours of interviews with firsthand sources, meeting notes, personal diaries, files and documents — is scheduled to hit shelves next week.