Manigault Newman worked with Trump on his reality television show, "The Apprentice".
The president also claimed this week that Manigault Newman had poor relationships with her co-workers, and that the only reason he let her continue at the White House was that she publicly praised him.
She even claims three sources told her that Trump was recorded using the N-word off-camera "multiple times".
The campaign alleges that Omarosa is in breach of a confidentiality agreement she signed.
Rep. Frederica Wilson on Tuesday unleashed a tirade on President Trump for calling Omarosa Manigault Newman a "dog" on Twitter, saying the president is a "white supremacist" and "everything that comes out of that White House is racist". "I wish you continued success".
"He knew that John Kelly was going to take me into the 'Situation Room, ' and lock me in there, threaten me, and say that things were going to get ugly for me, and there would be damage to my reputation", Newman said of Donald Trump. He offered her a "friendly departure", where she could resign to avoid damage to her reputation.
Trump on Monday denied the existence of any tape from "The Apprentice" in which he used the racial epithet. Asked about the pact, Manigault Newman told MSNBC she did not believe she had violated it. "The president is always somebody who's going to fight fire with fire", she said.
Ms Manigault Newman says she has more recordings.
In tweets Monday night, Trump denied ever using "such a awful and disgusting word", and his aides have denied having strategized about how to contain the damage if such a tape surfaced.
"This is someone now that makes me concerned". In her secret tape recording of me, it was one of many times that I would placate Omarosa to move the discussion along because I was tired of her obsession over this alleged tape.
Meanwhile, Trump's attorney, Rudy Giuliani, said on "Fox and Friends" Monday that Manigault Newman may have broken the law by recording private conversations inside the White House. Before becoming president, Trump himself had a reputation for quietly recording conversations during his business dealings in NY.
And that, she said, is more evidence of how Trump treats black people.
In her new book, Unhinged, she writes: "Taken as a whole, all of her style rebellions have served the same objective".
In a tweet, Trump called it "inconceivable" and "totally unheard of" that a lawyer would tape a client.
Sanders did claim ― falsely ― that previous administrations also used NDAs in the White House itself.