Sanders Can't Guarantee Trump Hasn't Used N-word

White House spokeswoman Sarah Huckabee Sanders says 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, but she added that Trump has been a high-profile businessman for decades and the allegations are only just now being made.

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."

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

Sanders told reporters that Manigault Newman has "shown a complete lack of integrity" with her criticism of Trump in her new book, adding 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.

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.