She alleges that, during the making of USA version of The Apprentice, which Trump fronted for several years, the future president muttered the racial slur "multiple times".
The Guardian newspaper reports that in the memoir, Manigault Newman labels Trump a "racist" and claims she's been told there are tapes of him using the N-word repeatedly while filming "The Apprentice" reality series on which she appeared.
Although some reports at the time of her departure late previous year claimed she tried to storm Trump's residence and protest her firing at the hands of Kelly, Manigault Newman disputes the public account of her dismissal in her book, according to The Post.
"The allegation is not credible, and indeed is ridiculous, particularly in light of the timing of her departure from the White House-December 12, 2017", Conway wrote in a tweet.
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It had finally sunk in that the person I had thought I had known so well for so long was a racist.
In her book, "Unhinged", she insisted that the reports are true, although she admits she had not personally heard him use the N-word.
After the "Access Hollywood" tape leaked in 2016, rumors mounted that there is unaired footage on "The Apprentice" of Trump making derogatory statements about women and minorities.
Earlier this week, the Daily Beast reported that Manigault Newman had recorded some of her interactions with the president in the White House. The campaign would have tasked her with "diversity" outreach. Tom Arnold, a former contestant on the show who was once married to disgraced star Roseanne Barr, said he has Trump tapes too. The two remain in contact, according to people familiar with the relationship.
White House spokeswoman Sarah Sanders told reporters here in New Jersey, where Trump is on vacation, that the book is "riddled with lies and false accusations". "He hated him. He never explained why, but now I believe it was because Obama was black". "It must have been something very, very sensitive", she wrote, according to the Post.