In another skirmish, Trump tweeted Monday that Manigault-Newman signed a non-disclosure agreement upon her exit from the White House.
While Manigault Newman's claims appear to make sense in the context she provides them, the jury is still out on how truthful her new book is overall.
Manigault-Newman - the director of communications for the White House Office of Public Liaison before she was sacked past year by Chief of Staff John Kelly - has been promoting a book about her time in the West Wing.
Manigault-Newman also taped Trump sounding surprised on the phone after being informed of her firing at Kelly's behest.
"While leering openly at her breasts, he said, 'she's a very, very sexy, desirably young woman who I'm looking forward to getting to know much better if you know what I mean with all due respect'".
'Now that she says bad about me, they will talk to her. Fake News!'
Omarosa is taking her Unhinged book tour to CBS This Morning on Tuesday. "I asked if I could go get my purse where I had stashed my inhaler, and they wouldn't let me leave the room".
It's unknown whether Manigault recorded any other conversations during her time at the White House, when she was the most senior African-American in the West Wing. In the tape, played on NBC's Today programme, Trump said: "Omarosa?".
Now, aides are wondering who else might be using a recording device to capture audio from private conversations.
"He had to protect himself from allegations that would come up, both personal and business", said Sam Nunberg, a former Trump campaign aide.
Pierson cited the December 14 ABC News interview with Manigault in which Manigault defends President Donald Trump, clearly stating he "is not a racist". In 2014, there was "lots of finger-pointing going on at Simon & Schuster", a source told Page Six, after the publisher reportedly paid Clinton $14 million in advance for her memoir, which sold 85,000 in its first week, reported The New York Times, but slowed to sell a disappointing 300,000 copies over the next 21 months, according to Time magazine.
"I took it all kind of at face value", she said.
Beyond their war of words, the row touched on several sensitive issues in Trump's White House, including a lack of racial diversity among senior officials, security in the executive mansion, a culture that some there feel borders on paranoia and the extraordinary measures used to keep ex-employees quiet.
On Monday, the former senior aide revealed a recording she'd made of the President phoning her on the day after she was sacked.
"Look at her MANY recent quotes saying", he added in a second tweet, "such wonderful and powerful things about me - a true Champion of Civil Rights - until she got fired". "I'm starting to think either none of this happened or they all at pieces of paper".
It was not clear exactly what he was referring to.
"Oh, I have plenty", she replied.
Newman was a guest on Matthews' show Hardball on Monday night.
Manigault Newman says she considered the statement a "threat".
In an unusual admission, Trump acknowledged that the public sparring was perhaps beneath a person in his position, tweeting that he knew it was "not presidential" to take on "a lowlife like Omarosa".