Elsewhere in her book, she claims the president suffers from "mental decline" and alleges she once saw Trump chew up a piece of paper after a meeting with his then-lawyer Michael Cohen.
Her dramatic divorce from a man she likens to a cult leader is the subject of a salacious, self-serving, mostly unverifiable account of her West Wing tenure, "Unhinged: An Insiders Account of the Trump White House" (Gallery Books, 330 pages).More news: Team gives medication to sick killer whale at sea
She previously stated in an interview on Friday with NPR that she has heard Trump on an Apprentice tape using the racial slur.
'I didn't want to believe it, ' she writes.
But he appeared to be bothered by the former Apprentice contestant's tell-all book where she claims he used the n-word and tried to buy her silence with a $15,000-a-month job.More news: Gary Woodland sets PGA Championship record before storm suspends play
Manigault Newman served as the director of communications for the White House's Office of Public Liaison and claims chief of staff John Kelly fired her because she was close to getting audio of Trump using the racial slur.
The remarks were a break with comments made during the campaign when the former reality television celebrity vowed that those who had criticized Trump would bend the knee to him. 'I rejected what other people said about him because they didn't know him like I did. She acknowledges she had never been able to obtain or hear the tapes but said three unnamed sources had described their contents.
"Instead of telling the truth about all the good President Trump and his administration are doing to make America safe and prosperous, this book is riddled with lies and false accusations", said White House press secretary Sarah Huckabee Sanders.More news: Bairstow and Woakes put England in strong position