In it, she paints a damming picture of President Donald Trump, including claiming that tapes exist of him using the N-word as he filmed his "The Apprentice" reality series.
The book alleges that Manigault Newman was offered $15,000 a month from the president's campaign coffers to stay silent after she was sacked from the White House last December.
In this photo, taken February 14, 2017, Omarosa Manigault-Newman, then an aide to President Donald Trump, watches during a meeting with parents and teachers in the Roosevelt Room of the White House in Washington.
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.
President Donald Trump greets cheering members of Bikers for Trump and supporters, Saturday, Aug. 11, 2018, at the clubhouse of Trump National Golf Club in Bedminster, N.J.
One year after Charlottesville rally, Donald Trump says he condemns all racism
Some leading figures in the USA white nationalist movement have said they won't attend or have encouraged supporters to stay away. Despite heightened emotions and frustration over the police presence, the city reports no arrests and no violent outbreaks.
"It's sad that a disgruntled former White House employee is trying to profit off these false attacks", she said.
Manigault Newman was previously best known for her polarizing character on NBC's "The Apprentice".
"I rejected what other people said about him because they didn't know him like I did".
Don't miss out on the latest news and information.
According to the Post, an excerpt from Unhinged also claims that Lara Trump, the President's daughter-in-law, and adviser offered Omarosa a job after she was sacked from The White House.
White House press secretary Sarah Huckabee Sanders criticized Unhinged as "riddled with lies and false accusations".