US President Donald Trump has rejected an author's accusations that he is mentally unfit for office, and says his track record shows he is "a very stable genius".
Trump has threatened to sue Wolff over his book, but Axios reported that his lawyers laughed at the president's bluster.
"Fire and Fury" author Michael Wolff.
But Mr Trump has criticised the book as inaccurate and its author as a "loser" who had little access to the President and mostly relied on Steve Bannon, his former top aide and chief strategist. It blew open what seems an inevitable feud between the publicity-loving president and his former adviser Steve Bannon, who is quoted extensively and unflatteringly describing Trump, his family and advisers.
"I authorized Zero access to White House (actually turned him down many times) for author of phony book!" the president wrote.
They include assertions that Trump never wanted to be president, that all of his senior staff considered him an idiot, that he tried to lock the Secret Service out of his room, and that he ate at McDonald's to avoid being poisoned.
Trump, who sought to block publication of the book but was too late, tweeted Thursday that it was "full of lies, misrepresentations and sources that don't exist". "He used Sloppy Steve Bannon, who cried when he got fired and begged for his job".
As one White House official told me early past year, foreign leaders reached out to Kushner, rather than Secretary of State Rex Tillerson, because they knew that Kushner and Ivanka would be the last ones standing beside the president.
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Mr Trump, in a series of morning tweets, said his Democratic critics and the United States news media were bringing up the "old Ronald Reagan playbook and screaming mental stability and intelligence" since they had not been able to bring him down in other ways.
Well, it looks like that getting Trump's attention could make you a decent amount of money, if you know how to use it that is.
Michael Wolff made the claim in an interview with the BBC, responding Mr Trump's description of his book as "boring and untruthful".
For his part, Trump went after Bannon in an unusual White House statement.
The break between Trump and Bannon, who had bonded over their shared nationalist beliefs and anti-establishment populism, apparently caused further problems for Bannon.
A spokeswoman for the book's publisher confirmed the cease-and-desist letter but told Variety, "We see "Fire and Fury" as an extraordinary contribution to our national discourse, and are proceeding with the publication of the book".
On Thursday, Mr Gingrich echoed Mr Trump's charge that Mr Bannon had "lost his mind".