Bannon, 64, was the top manager of the Trump campaign and the White House chief strategist in the first seven months of the Trump administration. He was fired on August 18.
"Steve Bannon has nothing to do with me or my Presidency. When he was fired, he not only lost his job, he lost his mind," Trump said in a statement.
"Steve was a staffer who worked for me after I had already won the nomination by defeating seventeen candidates, often described as the most talented field ever assembled in the Republican party," he said.
Yet Steve had everything to do with the loss of a Senate seat in Alabama held for more than thirty years by Republicans. Steve doesn't represent my base - he's only in it for himself, Trump said in an stinging attack on his former top advisor.
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Steve pretends to be at war with the media, which he calls the opposition party, yet he spent his time at the White House leaking false information to the media to make himself seem far more important than he was, Trump alleged.
Bannon was rarely in a one-on-one meeting with him and only pretends to have had influence to fool a few people with no access and no clue, whom he helped write phony books, Trump said.
"We have many great Republican members of Congress and candidates who are very supportive of the 'Make America Great Again' agenda. Like me, they love the United States of America and are helping to finally take our country back and build it up, rather than simply seeking to burn it all down," Trump said in a lengthy statement.
The book written by Michael Wolff gives an insight into the Trump's election campaign.
In a statement, the White House has disputed the contents of the book.
"This book is filled with false and misleading accounts from individuals who have no access or influence with the White House," White House Press Secretary Sarah Sanders said.
"Mrs Trump supported her husband's decision to run for President and in fact, encouraged him to do so. She was confident he would win and was very happy when he did".
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