White House spokeswoman Sarah Huckabee Sanders said in a Tuesday news briefing she cannot guarantee that President Donald Trump has never used a racial slur.

Sanders said “I haven’t been in every single room,” when asked if she can say with certainty that Trump has never used the N-word.

Ex-Trump aide Omarosa Manigault Newman has alleged she has heard Trump on tape using the slur.

Trump said Monday on Twitter that he doesn’t “have that word in my vocabulary, and never had.”

Trump said Monday on Twitter that he doesn’t “have that word in my vocabulary, and never had.”

Sanders says she “can’t guarantee” Trump has never used the word, but calls Manigault Newman’s claims “salacious and ridiculous.”

Sanders also says Manigault Newman has “shown a complete lack of integrity” with her criticism of President Donald Trump in her new book.

Press secretary Sarah Huckabee Sanders said Tuesday that Trump’s tweets referring to Manigault Newman as “crazed” and a “dog” reflect his “frustration” with her comments. Manigault Newman has responded that Trump has “absolutely no respect” for women or African-Americans.

MORE: Omarosa: I never signed that ‘draconian’ White House nondisclosure agreement

Sanders says Trump hired Manigault Newman as an assistant to the president because he “wanted to give her a chance.” She was a contestant on his reality show “The Apprentice” and a former campaign aide.

Manigault Newman has been releasing audio recordings of private White House conversations as part of her book roll-out tour. She was fired in December.

Earlier Tuesday, Trump’s campaign filed an arbitration action against Manigault Newman alleging breach of a secrecy agreement.

A campaign aide tells The Associated Press that it is filing the claim with the America Arbitration Association in New York, claiming her explosive new book and media tour breached her 2016 confidentiality agreement with the campaign. The person spoke on condition of anonymity because the person was not authorized to speak publicly on the matter. Manigault Newman has acknowledged signing a confidentiality agreement with the campaign in 2016.



Omarosa Manigault Newman talks with the PBS NewsHour’s Judy Woodruff

Manigault Newman told the PBS NewsHour on Monday that she never signed a nondisclosure agreement when she worked at the White House, as Trump has claimed.

“I never signed that draconian NDA that they presented to me when I walked into the White House,” she told PBS NewsHour anchor and managing editor Judy Woodruff.

She wrote in her book that after being fired from the White House in December 2017 was offered a $15,000 per month position with the Trump re-election effort in exchange for signing a new confidentiality agreement. She says she declined that offer.

The Associated Press wrote this story. The PBS NewsHour will provide updates as they develop.