Washington: President Donald Trump’s lawyer said on Thursday he would try to stop publication of a book that portrays an inept president in a fumbling White House and threatened legal action against former top aide Steve Bannon over ‘defamatory’ comments in the book.

‘Fire and Fury: Inside the Trump White House’ by author Michael Wolff set off a political firestorm with its portrayal of Trump as not particularly wanting to win the U.S. presidency in 2016 and unprepared for the job.

Some of the harshest commentary came from Bannon, the right-wing firebrand who headed the final stage of Trump’s campaign and became chief strategist at the White House before being fired in August.

Charles Harder, Trump’s personal lawyer, in a legal notice provided to Reuters, warned of possible claims including libel against Wolff and publisher Henry Holt & Co and threatened to try to block publication of the book. Harder also told Reuters that ‘legal action is imminent’ against Bannon.

Henry Holt said in a statement it had received a cease-and-desist letter from Trump’s attorney but would go ahead with publishing the book.

Earlier, the publishing house said that ‘due to unprecedented demand,’ it would release the book on Friday morning, rushing it to print after previously planning to put it out next Tuesday.

Wolff did not respond to a request for comment.

Trump cut ties with Bannon on Wednesday, saying his former adviser had ‘lost his mind,’ in a blistering statement issued after comments attributed to Bannon in the book were made public.

White House spokeswoman Sarah Sanders heaped scorn on Bannon and the book at her briefing on Thursday. She said Breitbart News should consider firing Bannon and attempted to cast doubt on Wolff’s accuracy.

She called the book ‘some trash’ that came from ‘an author that no one had ever heard of until today.’

‘This book is mistake after mistake after mistake,’ she said.

Trump lawyers sent a cease-and-desist letter to Bannon on Wednesday asking him not to disclose any confidential information. They said Bannon had breached an agreement by communicating with Wolff about Trump, his family and the campaign and made ‘disparaging statements and in some cases outright defamatory statements’ about them.

In the book, Bannon was quoted as describing a June 2016 meeting with a group of Russians at Trump Tower in New York as ‘treasonous’ and ‘unpatriotic.’ The meeting, held after the Russians promised damaging information on Democratic presidential candidate Hillary Clinton, was attended by Donald Trump Jr., Trump’s son-in-law, Jared Kushner, and Paul Manafort, Trump’s campaign manager at the time.

Trump’s statement also diminished Bannon’s role in the election victory and accused him of leaking to the media. Before joining the campaign, Bannon headed the conservative Breitbart News website and proved to be a divisive figure in the White House. He returned to Breitbart after being fired, although he is reported to have continued to talk with Trump.