"It's all about him", Wolff told NBC's "Today" show.
Publisher Henry & Holt Company had planned a Jan. 9 release.
"Where do I send the box of chocolates?"
Trump's stability has been questioned by critics almost since he declared his candidacy for the presidency.
Earlier Friday, Trump heaped praise on a major Republican donor family from distancing themselves from Bannon. He reported from inside Trump Tower in New York City and later from inside the White House. So on the first day of the presidency, when he announces that the inaugural crowds were three or four or five times larger than they actually were, you couldnt say to him Thats not true!
According to multiple media reports, about a dozen lawmakers from the House and Senate received a briefing from Yale psychiatrist Bandy X Lee on Capitol Hill about Trump's fitness to be president. "Too bad!" Trump tweeted. Colbert joked. "I agree with Steve Bannon?".
Sanders also called Wolf "a guy who made up a lot of stories to try and sell books". A development that Trump pointed to in a tweet on Friday.
Doug Deason said that the Mercers "were attracted to [Bannon] because he's so brilliant and he's had some great ideas, but the problem is that he's got this huge, huge ego, bigger than Donald Trump and it gets in the way of his success". He also says he never spoke with the book's author.
The fallout does seem to have damaged Bannon's credibility, with many former supporters, including Rebekah Mercer, the billionaire backer of Bannon's website Breitbart News. The publisher instead moved up the release date to Friday.
The two men appeared to be publicly cordial until Wednesday, when a British newspaper published excerpts of a book by author Michael Wolff quoting Bannon at length. On one hand, Colbert noted, "the White House has called everything in the book a lie".