Her book also describes him as scattered, self-absorbed, misogynistic and insecure.
Trump seemed to enjoy himself at the event tweeting on Saturday: 'Hundreds of Bikers for Trump just joined me at Bedminster.
In addition to Newman's claims that Trump is a racist and a bigot, Newman claims that first lady Melania Trump will divorce her husband when his presidency ends and that she was offered "hush money" to stay mum about her time in the White House.
Trump has responded by calling his former aide a "lowlife". Asked by TMZ if it's fair to say that the president is "causing tensions among African-Americans right now" after the "LeBron James situation", she replied with a s short sentence: "he wants to start a race war". "It's how I'm going to make great deals for the country".
But when pressed about her version in the book, Manigault Newman told to NPR: "I heard the tape". She said he then played it off as a joke but she knew he was serious.
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.
According to multiple reports, she cites three unnamed sources in "Unhinged" who claim to have heard Trump use the "N-word" repeatedly during the making of The Apprentice.
Despite her claims, the White House has vehemently denied her writing, instead writing her off as a "disgruntled former White House employee" who is "trying to profit off these false attacks", according to The Hill. "Every critic, every detractor, will have to bow down to President Trump", Manigault Newman said in an interview with PBS in 2016.