"She claims to have heard from someone who heard from me that I heard Trump use the N-word", he said in an August 10 tweet.
He also described her as a "crazed, crying lowlife" who he gave "a break" and "a job at the White House".
The alleged tape figures a central role in Manigault's book, where she says that she sought to uncover the evidence of racism until she was sacked by White House chief of staff John Kelly. On her publicity tour for the book, she has claimed that she heard a tape recorded from his days on "The Apprentice" in which he uses the racial slur multiple times.
"@MarkBurnettTV called to say that there are NO TAPES of the Apprentice where I used such a bad and disgusting word as attributed by Wacky and Deranged Omarosa". "He's being puppeted", she said. The former reality star also said even if the president had used the slur, it wouldn't impact his base.
Ms Manigault-Newman rose to fame as a contestant on reality TV show "The Apprentice" in 2004. She said "he tried in his own way" to bring Americans together.
After growing up in a housing project in Youngstown, Ohio, and losing her father at age 7 - he was murdered - Manigault Newman emerged from a turbulent youth to earn a degree in broadcast journalism at Central State University and land a job in the office of then vice president Al Gore at age 23.
"While I know it's "not presidential" to take on a lowlife like Omarosa, and while I would rather not be doing so, this is a modern day form of communication and I know the Fake News Media will be working overtime to make even Wacky Omarosa look legitimate as possible".
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He had to laugh, though, at Omarosa talking about the White House allegedly covering up that Trump is "mentally declined".
The watershed moment came, it appears, in the months after Trump appointed Gen. John Kelly as his chief of staff.
But while Trump's move from Democratic donor and NY libertine to über-conservative GOP cult leader took years to execute, Manigault Newman's evolution feels like it's happening in real time. "The fact that she tape recorded various conversations, that's going to add more drama to the story if things come out about Trump making inappropriate statements", said Prof O'Connor. "As usual, when all of Trump's people turn on him, the White House runs it's smear campaign playbook", he said. "The White House is basically a reboot of The Last Supper: Oops, All Judases".
It was not clear exactly what he was referring to.
LTo the many dozens of #journalists who called me, questioning @OMAROSA claim in her new book that @POTUS @realDonaldTrump took a note from me, put it in his mouth and ate it.I saw NO such thing and am shocked anyone would take this seriously.
In the recording with Kelly, which Manigault Newman quotes extensively in her new book, Kelly can be heard saying that he wants to talk with her about leaving the White House.
"The allegation is not credible, and indeed is ridiculous, particularly in light of the timing of her departure from the White House-December 12, 2017", he said in an August 10 tweet.