"The NDA attached to the email was as harsh and restrictive as any I'd seen in all my years of television," Manigault Newman writes in the book.
The Trump campaign did not respond to a request for comment on Friday.
In a statement, White House press secretary Sarah Huckabee Sanders said the book "is riddled with lies and false accusations. It's sad that a disgruntled former White House employee is trying to profit off these false attacks, and even worse that the media would now give her a platform, after not taking her seriously when she had only positive things to say about the President during her time in the administration."
President Donald Trump speaks during a meeting on African American History Month with Omarosa Manigault Newman (left),Photo: AP
The allegations threaten to become another political headache for the administration akin to another controversial book earlier this year by journalist Michael Wolff, Fire and Fury: Inside the Trump White House, which detailed a wayward White House and prompted broad denunciations from Trump and his aides. The White House had initially planned on trying to avoid commenting on the Manigault Newman's book to keep it from getting more attention, White House aides said.
Manigault Newman is expected to appear on MSNBC on Sunday morning and will then go on a longer publicity tour.
Her book is the first insider account from a White House aide that is not largely flattering toward the President. Manigault Newman, who was the highest-ranking black employee in the White House, calls Trump a "racist, misogynist and bigot".
She alleges in the book that there is a tanning bed in the White House residence and says the President fought with the now-departed chief usher over the installation of the bed; other aides say they have not seen a tanning bed in the White House.
Manigault Newman also writes that Trump told her he was unaware of her firing by Kelly. "No! No one even told me," she quotes Trump as saying. "I didn't know that. Damn it."
Whether the book paints an accurate depiction of Trump's conduct or amounts primarily to a disgruntled tome from a reality TV star-turned-White House aide is in dispute. Manigault Newman has known Trump for more than a decade and held one of the highest-paid positions in the West Wing for a year, securing the job as an "assistant to the President" after starring as a famed villain in his TV show, The Apprentice, and working for the Trump Organisation.
Manigault Newman does not offer evidence for some of her most explosive charges but also extensively taped her conversations in the White House, according to people familiar with the tapes.
Manigault Newman litters the book with specific quotes from White House aides. She describes many scenes inside the White House vividly - explaining who was in the room and exactly what was said.
She questions Trump's mental state, describes him as unstable and portrays him as unable to control his impulses while describing the extensive lengths that staff members have gone to in attempts to keep him in line.
"All we need to remember is that Trump loves the hate," she writes in the book. "He thrives on criticism and insults. He delights in chaos and confusion. Taking to Twitter to call him names only fuels him and riles his base. To disarm him, starve his ego; don't feed into it."
Adviser Kellyanne Conway (left) with former aide Omarosa Manigault and White House Communications Director Mike Dubke in April, 2017.Photo: AP
White House aides have long described Manigault Newman as a problematic employee who tried to stage a wedding photo shoot at the White House, exploded at other West Wing aides and left shoes strewn around the West Wing. For months, they accurately feared that she was taping conversations inside the building. In the eyes of many around Trump, the book is another publicity-grabbing stunt from a reality TV star known for them.
Even as aides warned him against it, Trump often spoke to Manigault Newman and invited her to come by the Oval Office, a practice that Kelly eventually curtailed. She served as Trump's chief liaison to the African American community and often vouched for him.
The book is a mix of unverified accusations and vivid, quote-filled exchanges from her time with Trump on the campaign trail and in the White House.
For months while in the White House, Manigault Newman said she spent time searching for a rumoured tape of Trump saying the n-word on tape as host of The Apprentice. She writes in the book, without providing evidence, that such a tape exists. Manigault Newman also says that other aides in the White House kept tabs on rumours of the tape.
Omarosa became close to Donald Trump after earning a reputation as the villain on The Apprentice.Photo: Supplied
"By that point, three sources in three separate conversations had described the contents of this tape," she writes. "They all told me that President Trump hadn't just dropped a single n-word bomb. He'd said it multiple times throughout the show's taping during off-camera outtakes, particularly during the first season of The Apprentice."
In early 2017, Manigault Newman says she walked Michael Cohen, then Trump's personal lawyer, into the Oval Office for a meeting with Trump - and saw the President chewing up a piece of paper while Cohen was leaving the office. Another White House official confirmed that Manigault Newman brought Cohen into the White House and was later rebuked for it.
"I saw him put a note in his mouth. Since Trump was ever the germaphobe, I was shocked he appeared to be chewing and swallowing the paper. It must have been something very, very sensitive," she writes in her book.
There is no proof that he chewed on paper, and several White House aides laughed at the assertion and said it was not true.
Manigault Newman also writes in the book that she was contacted in February by the FBI, but does not elaborate on why they called her or what she told them.
She describes in vivid detail her firing from the Situation Room, with direct quotes attributed to Kelly and ethics lawyer Stefan Passantino.
According to her account, Kelly comes into the room and begins by saying, "We're going to talk to you about leaving the White House".
"The integrity issues are very serious," Kelly continues. "If this were the military, this would be a pretty high level of accountability, meaning a court-martial... If we make this a friendly departure, you can look at your time here in the White House as a year of service to the nation. You can go on without any type of difficulty in the future relative to your reputation."
Manigault Newman then begins demanding an explanation for why she was being fired and whether Trump knows. Kelly tells her it is nonnegotiable and soon leaves the room after mentioning "serious integrity issues".
"The staff works for me, not the President. So after your departure, I'll inform him," Kelly told her, according to the book. "With that, I'll let you go."
She is kept in the Situation Room for more than an hour, according to her telling in the book, with her husband waiting outside. She fights with Passantino, who tells her she is being fired for abusing the government car service. She tries to explain why she used the car each time - for official government business, in her telling - to no avail.
"It's not a fight that is winnable," Uttam Dhillon, another lawyer, says.
Manigault Newman writes in the book that there was erroneous reporting on her exit - that she did not get into a big fight with Kelly at the White House Christmas party and that she did not try to fight her way past security and get into the residence.
"I never imagined that this ludicrous story - pure gossip - would blow up like it did," she said.
Passantino did not respond to a request for comment.
Trump tells Manigault Newman that he had no idea she was ousted the day before, according to her account. "I just saw on the news you were thinking about leaving!" Trump says. "What happened?"
Manigault Newman responds that Kelly told her "you guys wanted me to leave". Trump expresses his displeasure.
Manigault Newman said the call from Trump was followed by a call from Jared Kushner, Trump's son-in-law, and Ivanka Trump, his daughter, who said she "really loves" Manigault Newman and would do anything for her.
"Call us anytime," Kushner says on the call, according to the book.
Then, Lara Trump called and reiterated how much the President and the family loved Manigault Newman, offering her the job and wanting to make sure "everything is positive".
"If you come on board, we can't have you mention that stuff," she added, referring to interviews Manigault Newman gave immediately after her firing.
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