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.
Manigault Newman, who got her big break as a contender on Trump's canceled TV show, The Apprentice, has, in the words of the NY magazine's Jonathan Chait "met a wall of skepticism bordering on reflexive disbelief".More news: Kanye West Responds To Claims That Jimmy Kimmel's Trump Question Stumped Him
That goes double for the more outlandish claims in the book, such as the claim that Trump brought a tanning bed into the White House, an episode where Trump allegedly ate a piece of paper after a meeting and Trump's purported racist comments aimed at Kellyanne Conway's half-Filipino husband.
Trump was responding to a question from New York Times reporter Maggie Haberman about Manigault Newman's tell-all memoir that was announced this week.
Mr Trump was sworn in using two Bibles; his own and one used at Abraham Lincoln's inauguration in 1861.More news: Maryland coach DJ Durkin placed on leave by administration as investigation begins
She also claims Trump's campaign offered her a contract for $15,000k a month to keep quiet about her time in the administration, The Hill reported.
In the book, Manigault Newman painted the president as scattered, self-absorbed, misogynistic and insecure.
The president tweeted about the event, saying "hundreds of bikers for Trump just joined me in Bedminster" and called them great people who love our country. She acknowledges she had never been able to obtain or hear the tapes but said three unnamed sources had described their contents. The White House has already slammed it as "riddled with lies and false accusations".More news: Is the US-Turkey crisis beyond repair? | USA
But CNN reports that The White House has called Omarosa a "disgruntled former employee" who is trying to make a buck off of fake stories.