President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE on Monday pushed back against allegations by former White House aide Omarosa Manigault Newman Omarosa Onee Manigault NewmanTrump hurls insults at Harris, Ocasio-Cortez and other women Pelosi makes fans as Democrat who gets under Trump's skin The Memo: Impeachment's scars cut deep with Trump, say those who know him MORE that he used the "N-word" on the set of "The Apprentice."

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"I don’t have that word in my vocabulary, and never have. She made it up," Trump tweeted, deriding his former aide as "Wacky and Deranged Omarosa."

Manigault Newman, who rose to fame via multiple appearances on "The Apprentice," has claimed she heard tapes where Trump repeatedly uses the racial slur during filming of his old NBC reality show.

Trump claimed in his tweet Monday night that Mark Burnett, the creator of "The Apprentice," called to say no such tapes exist.

In a subsequent tweet, Trump pointed to Manigault Newman's past comments about him, where she denied he was a racist.

.@MarkBurnettTV called to say that there are NO TAPES of the Apprentice where I used such a terrible and disgusting word as attributed by Wacky and Deranged Omarosa. I don’t have that word in my vocabulary, and never have. She made it up. Look at her MANY recent quotes saying.... — Donald J. Trump (@realDonaldTrump) August 13, 2018

....such wonderful and powerful things about me - a true Champion of Civil Rights - until she got fired. Omarosa had Zero credibility with the Media (they didn’t want interviews) when she worked in the White House. Now that she says bad about me, they will talk to her. Fake News! — Donald J. Trump (@realDonaldTrump) August 13, 2018

During the 2016 presidential campaign, Burnett faced pressure to release tapes from the set of "The Apprentice" after it was revealed Trump bragged about groping women during a hot-mic recording from NBC's "Access Hollywood."

Burnett, who issued a statement in October 2016 condemning Trump's candidacy, did not confirm at the time whether such footage exists, but said he did not have the rights to release it.

The New York Times reported that Trump's contract for "The Apprentice" gives him control over his name and likeness. As a result, parent company MGM would have to get Trump's permission to release the tapes.

Former "Apprentice" contestant Summer Zervos, who has accused Trump of sexual misconduct, asked MGM earlier this year to turn over unseen recordings from the show as part of her lawsuit against him.

Manigault Newman, who was fired from her West Wing job in December, has returned to the spotlight in recent days to promote her book, "Unhinged: An Insider's Account of the Trump White House."

The memoir contains a number of shocking claims, many of which are unverified. She alleges Trump is a racist, a misogynist and a narcissist. She writes that she had not heard the tapes of Trump using the "N-word" on "The Apprentice" set, but has said she's listened to them since the book went to print.

She described the tape on MSNBC's "Hardball" on Monday. She said Trump used the racial slur to describe Kwame Jackson, a fellow contestant on the first season of "The Apprentice."

"It sounded as if he used it every day," Manigault Newman said.

She claimed that the individual in possession of the tape used to be part of the production staff and is planning to use the recording for political purposes.

"And they saw it — took it on themselves to actually document this so that they could expose him for the racist that he is," Manigault Newman said.

Trump has faced criticism for his use of racially charged rhetoric since he first announced his candidacy, when he referred to illegal immigrants crossing the southern border as "rapists" and drug-dealers.

A number of lawmakers, including some Republicans, condemned the president for making racist remarks when he referred to Haiti and some African nations as "shithole" countries.

In an effort to undermine Manigault Newman's credibility, White House aides have noted that she was previously effusive in her praise of Trump before, during and immediately after her stint in the White House.

Upon her departure in December, she denied in an interview that Trump is racist, saying "I would never sit nor work for someone who I believe to be a racist."

White House staffers have made a concerted effort to paint Manigault Newman as a disgruntled former employee trying to profit from her time in the administration.

“Instead of telling the truth about all the good President Trump and his administration are doing to make America safe and prosperous, this book is riddled with lies and false accusations," White House press secretary Sarah Huckabee Sanders said in a statement on Friday.

On Sunday, White House counselor Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE said she's never heard Trump use a racial slur in her two years working with him.

"The first time I ever heard Omarosa suggest those awful things about this president are in this book," Conway said. "And I think that Omarosa unfortunately has undercut her own credibility."

Updated at 10:50 p.m.