WASHINGTON (AP) — A former White House staffer is claiming in a new book that President Donald Trump has exhibited a ‘‘mental decline that could not be denied.’’

An excerpt from Omarosa Manigault-Newman’s new book was published Thursday by DailyMail.com.

The former reality television star, who appeared on Trump’s ‘‘The Apprentice’’ and later served as an assistant to the president, says she was disturbed by a famous interview Trump gave to Lester Holt.