It depicts a chaotic White House, a president who was ill-prepared to win the office in 2016, and Trump aides who scorned his abilities.
"Due to unprecedented demand, we are moving the on-sale date for all formats of 'Fire and Fury, ' by Michael Wolff, to Friday, January 5, at 9 a.m. ET, from the current on-sale date of Tuesday, January 9", said a spokesperson to CNN.
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.
Trump's lawyers sent Wolff and his publishers cease-and-desist letters, as they had to Bannon.
Those anecdotes show how unprepared Trump is for the presidency, and how he ignores or disregards advice and follows his instincts wherever they lead - even when he contradicts himself.
On Thursday, Mr Gingrich echoed Mr Trump's charge that Mr Bannon had "lost his mind".
Travis Gettys is an editor for Raw Story.More news: 'Lady Bird' wins Golden Globe for best comedy movie
But the book's author, Michael Wolff, says he can't be sure that all of it is true.
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. Full of lies, misrepresentations and sources that don't exist.
"I went from VERY successful businessman, to top T.V. Star ... to President of the United States (on my first try)". "You ask people, you get as close as you can to the event, you interview the people who were privy to the event, you interview other people who were privy to the event, you come to know the circumstance as well as anybody and then you report it. But it certainly wasn't off the record", Wolff said on NBC on Friday morning.
However, threatening to block publication of the book is "very ill-advised" and makes Trump look "weak", Bennett said.
"My credibility is being questioned by a man who has less credibility than, perhaps, anyone who has ever walked on Earth", Wolff said.
Harder's threat letter poses a greater risk to Bannon than the truly empty threat of a defamation-related lawsuit naming Wolff and his publishers.
The phones at BookPeople were ringing non-stop for orders of Amazon's number one seller Fire and Fury: Inside the Trump White House.