When asked on "Meet the Press" how often she made recordings during her time working for President Donald Trump, Omarosa said: "This is a White House where everybody lies. you have to have your own back".
Manigault Newman landed in Washington D.C. on Saturday to kick off a publicity tour for her soon to be released book, "Unhinged", that is chock-full of explosive - though unverified - details about life in the White House.
Manigault Newman's book, Unhinged, characterises the USA president as a bigot, sexist and racist who she claims has been caught on mic using the N-word multiple times.
Manigault Newman, 44, met Trump in 2004 when she was a candidate on the American version of The Apprentice, which he hosted.
"I have heard for two years that it existed, and once I heard it for myself it was confirmed what I feared the most, that Donald Trump is a con and has been masquerading as someone who is actually open to engaging with diverse communities", she said Sunday.
Manigault Newman was previously best known for her polarizing character on NBC's "The Apprentice" in 2004.
Newman made the charge during an exclusive interview with NBC's "Meet the Press," days before the release of her new book on Tuesday, "Unhinged". She said he then played it off as a joke, but she knew he was serious'.
Manigault Newman's book also alleges how Trump made a farcical effort to sell copies of his book Trump: The Art Of The Deal at his inauguration as President in January past year.
She alleges that, during the making of U.S. version of The Apprentice, which Trump fronted for several years, the future president muttered the racial slur "multiple times".
Meanwhile, the GOP's official Twitter account blasted her. She also described him as a man who "loved conflict, chaos and confusion; he loved seeing people argue or fight". Add Donald Trump as an interest to stay up to date on the latest Donald Trump news, video, and analysis from ABC News.
As reports of accounts inside the book leaked out, White House Press Secretary Sarah Sanders slammed Manigault Newman as a "disgruntled former White House staffer" whose book is "riddled with lies and false accusations".
Other claims by Omarosa's book have been emerging.
The offer of money and a job in exchange for signing a non-disclosure agreement, however, raised Manigault Newman's hackles.