Michael Wolff, the author of a newly released book about President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE’s White House, said he has heard that Trump is “bouncing off the walls” with anger over the book.

Wolff told The Hollywood Reporter that he still has sources in the White House who have filled him in on Trump’s reaction to “Fire and Fury: Inside the Trump White House.”

“I hear that the president is very angry, or, let me be precise: I hear that he is truly bouncing off the walls,” Wolff said.

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He added that he didn’t get the sense that Trump “has thought of anything other than himself at any given time.”

“Certainly he was very open with me, accessible with me, and then he started to talk. Did he ever listen to me for one second? I never got that feeling. He just talks at you,” Wolff said.

Wolff’s book, along with news that a group of mostly Democratic lawmakers met with a psychiatrist for a briefing on Trump’s mental health, has prompted questions about Trump’s mental state.

Trump hit back at those questions in a series of tweets early Saturday, saying he was a “stable genius” and “like, really smart.”

The president's chief of staff John Kelly John Francis KellyMORE also reportedly told a White House pool reporter on Saturday that he had not seen Trump’s tweets from that morning.

Tidbit: Chief of Staff John Kelly told reporters that he had *not* seen the president's tweets yet from this morning- we read them to him. He responded, "Ok" — Elizabeth Landers (@ElizLanders) January 6, 2018

After reading them, Kelly said Trump tweeted to get his rebuttal of the claims in Wolff’s book out without using the media.