Michael Wolff says Donald Trump is least credible person ‘who has ever walked on earth’

Michael Wolff, the author of a new book that gives a behind-the-scenes account of the White House, defended his work Friday, insisting he spoke with President Donald Trump on the record and calling the commander-in-chief "a man who has less credibility than, perhaps, anyone who has ever walked on earth."

Wolff, in an exclusive interview on "Today," said that everyone he spoke to for the book offered the same description of the president.

They all said “he is like a child," Wolff said.

Wolff also contended that he "absolutely" spoke to the president during his reporting of the book.

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Fire and Fury: Inside the Trump White House
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Fire and Fury: Inside the Trump White House
CORTE MADERA, CA - JANUARY 05: Copies of the book 'Fire and Fury' by author Michael Wolff are displayed on a shelf at Book Passage on January 5, 2018 in Corte Madera, California. A controversial new book about the inner workings of the Trump administration hit bookstore shelves nearly a week earlier than anticipated after lawyers for Donald Trump issued a cease and desist letter to publisher Henry Holt & Co. (Photo by Justin Sullivan/Getty Images)
CORTE MADERA, CA - JANUARY 05: Copies of the book 'Fire and Fury' by author Michael Wolff are displayed on a shelf at Book Passage on January 5, 2018 in Corte Madera, California. A controversial new book about the inner workings of the Trump administration hit bookstore shelves nearly a week earlier than anticipated after lawyers for Donald Trump issued a cease and desist letter to publisher Henry Holt & Co. (Photo by Justin Sullivan/Getty Images)
A man holds a copy of the book 'Fire and Fury: Inside the Trump White House' by Michael Wolff after buying it at a bookstore in Washington, DC on January 5, 2018. The book was rushed into bookstores and onto e-book platforms four days ahead of schedule due to what its publisher called 'unprecedented demand' -- and after Trump's bid to block it failed. The book -- which has sent shockwaves across Washington -- quickly sold out in shops in the US capital, with some even lining up at midnight to get their hands on it. Trump has decried the instant best-seller as 'phony' and 'full of lies.' / AFP PHOTO / ANDREW CABALLERO-REYNOLDS / The erroneous mention[s] appearing in the metadata of this photo by ANDREW CABALLERO-REYNOLDS has been modified in AFP systems in the following manner: [January 5, 2018] instead of [December 5, 2018]. Please immediately remove the erroneous mention[s] from all your online services and delete it (them) from your servers. If you have been authorized by AFP to distribute it (them) to third parties, please ensure that the same actions are carried out by them. Failure to promptly comply with these instructions will entail liability on your part for any continued or post notification usage. Therefore we thank you very much for all your attention and prompt action. We are sorry for the inconvenience this notification may cause and remain at your disposal for any further information you may require. (Photo credit should read ANDREW CABALLERO-REYNOLDS/AFP/Getty Images)
MEET THE PRESS -- Pictured: (l-r) Michael Wolff, author, Fire and Fury: Inside the Trump White House and moderator Chuck Todd appear on 'Meet the Press' in Washington, D.C., Sunday, Jan. 7, 2018. (Photo by: William B. Plowman/NBC/NBC NewsWire via Getty Images)
MEET THE PRESS -- Pictured: (l-r) Michael Wolff, author, Fire and Fury: Inside the Trump White House and moderator Chuck Todd appear on 'Meet the Press' in Washington, D.C., Sunday, Jan. 7, 2018. (Photo by: William B. Plowman/NBC/NBC NewsWire via Getty Images)
TODAY -- Pictured: Savannah Guthrie and Michael Wolff on Friday, January 5, 2018 -- (Photo by: Nathan Congleton/NBC/NBCU Photo Bank via Getty Images)
TODAY -- Pictured: Michael Wolff on Friday, January 5, 2018 -- (Photo by: Nathan Congleton/NBC/NBCU Photo Bank via Getty Images)
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"It was certainly not off the record," Wolff said.

The book, "Fire and Fury: Inside the Trump White House," features behind-the-scenes anecdotes from Trump's White House, including details on how the most powerful men and women in Washington worked to make Trump president — and turned on one another after he took the oath of office.

Widely reported excerpts from the book have roiled Washington, including claims from former top Trump administration and campaign aide Steve Bannon that Donald Trump Jr.'s meeting with Russians at Trump Tower in June 2016 was "treasonous" and "unpatriotic."

Trump, however, said on Twitter Thursday night that he "authorized Zero access to White House" for the author and "never spoke to him for book." The president also used the term "Sloppy Steve," apparently referring to Bannon.

Hitting back at Trump, Wolff said Friday that Trump isn't one to talk when it comes to credibility.

"My credibility is being questioned by a man who has less credibility than, perhaps, anyone who has ever walked on earth at this point," Wolff said.

Wolff’s book was released early Friday by Henry Holt, which announced a day earlier it was pushing up the publication date due to demand. Earlier Thursday, Trump attorney Charles Harder demanded in a letter sent to Wolff and his publisher, that the book not be published or disseminated. The book reached No. 1 on the Amazon best-seller list Wednesday.

A copy of the letter obtained by NBC News cites defamation, libel and "actual malice" among the alleged wrongdoings in the book.

NBC News has not confirmed much of the book. Wolff has been accused in the past of suspect reporting, most notably in his 1998 book "Burn Rate." In its review, the defunct media journal Brill's Content cited 13 people depicted in the book as saying that Wolff invented or changed quotations and that they couldn't recall his taking any notes or recording their interviews.

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