But Attorney General Jeff Sessions, whom the President once called "beleaguered", is.
Wolff claims that the president has a low opinion of the intelligence of his other sons - Donald Jr. and Eric - saying, "Their father took some regular pleasure in pointing out that they were in the back of the room when God handed out brains".
Trump hailed that move on Twitter Friday, saying: "The Mercer Family recently dumped the leaker known as Sloppy Steve Bannon".
Wolff, the author of "Fire and Fury: Inside the Trump White House" said he spent three hours with Trump during the presidential campaign and in the White House, rebutting Trump's claim he never spoke with the writer for the book.
Trump later tagged Bannon with one of his infamous nicknames, calling him "Sloppy Steve".
A parade of administration officials and allies worked to discredit Bannon as a disgruntled has-been.
During her afternoon press conference Thursday, White House Press Secretary Sarah Huckabee Sanders defended questions about Trump's mental capacity to serve as the President.
"The phones started ringing off the hook, as soon as we opened, customers' request after request for the new book", said Meredith Hylton, the manager at Indy Reads Books.
"Michael Wolff is a total loser who made up stories in order to sell this really boring and untruthful book", Trump wrote.
"I did a quick interview with this guy a long time ago, having to do with an article, but I don't know this man", Trump said.
The investigation by Mueller, a former FBI director, is looking into whether the Trump campaign colluded with Russia to help get him elected - a charge the president has repeatedly and vehemently denied.
The book was released four days ahead of schedule due to an effort by lawyers for President Donald Trump to stop its publication. Have you been reading the news at all for the past year?
President Donald Trump slammed reports questioning his mental stability in a series of tweets Saturday morning, writing he's a "very stable genius". Steven Bercu, CEO and Co-owner of BookPeople said more than 100 people have placed book reservations for the new shipment Monday.
Amid such backlash, Steve Bannon, Trump's campaign chief executive and former White House strategist who is a major source for Wolff's book, appears increasingly isolated.
"Bannon has no contingent", former Republican House Speaker Newt Gingrich said Wednesday between media interviews to defend Trump. Trump said earlier this week that Bannon had "lost his mind".
Republican Senate Majority Leader Mitch McConnell, a longtime punching bag for Bannon, reveled in the aide's break with the president. Trump has said the book is full of lies.
Asked how he felt about the President's attempt to keep the book off shelves, Mr Wolff quipped, "Where do I send the box of chocolates?"
So a lot of this fight right now is a surprise to me because I didn't see it coming.
White House aides have depicted the book as a work of fiction.
Bannon's political standing was already weakened after he went all-out last month to support failed Alabama Senate candidate Roy Moore despite multiple allegations of sexual misconduct against Moore.
But Trump says he has not spoken to Wolff. News outlets need to stay reserved on the content of the book before embracing it all as pure fact.
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