The new book about President Trump, "Fire and Fury" which is now available to purchase, earlier than originally projected.
Its author paints an unflattering image of the commander-in-chief, suggesting he is not fit for the job.
And the book's author is defending his work despite white house attacks against its credibility.
On Friday, President Trump pelted with questions about the explosive book, "Fire and Fury."
Showing restraint but earlier taking to Twitter to unleash some fury of his own calling the book, "full of lies, misrepresentations, and sources that don't exist."
Mr. Trump's legal team tried to block the book's release.
In such high demand, it hit shelves Friday, four days early.
In an exclusive interview on "Today," author Michael Wolff said the president's threats will only boost his sales.
And Wolff insisted the account is accurate, despite some of the president's former top aides saying they were misquoted.
"I am certainly and absolutely in every way comfortable with everything I’ve reported in this book,” Wolff said.
Noting he recorded some interviews and spoke with the president.
“Whether he realized it was an interview or not, I don't know, but it certainly was not off the record,” Wolff said.
When pressed by Savannah on his assertion that those around the president question his fitness for office?
“Let me put a marker in the sand here, 100% of the people around him,” Wolff said.
Even claiming the president's aides all describe him the same way.
“They all say he is like a child, and what they mean by that is he has a need for immediate gratification, it is all about him,” Wolff said.
Friday morning the president's supporters fired back in force.
“It is absolutely outrageous to make these types of accusations and it is simply untrue," said White House Press Secretary, Sarah Sanders.
And disputed several facts, including that now First Lady Melania Trump cried about moving to the White House.
"I’m a nice guy… I certainly said what was ever necessary to get the story,” Wolff said.
The president on Friday night also lashed out at his former top adviser Steve Bannon who is a central character and critic in the book.
Bannon may be facing an uncertain future with his conservative media company Breitbart, thinking about firing him, and with an increasing number of Republicans making it clear they stand with the president.