The fired FBI Director James Comey describes President Trump as "untethered to truth" and "ego-driven" in his explosive forthcoming book "A Higher Loyalty," according to excerpts obtained by The Associated Press and other news outlets Thursday.

In the book, which hits shelves April 17, Comey goes so far as to question the strength of Trump's marriage to his wife, Melania, after revealing that Trump asked him to investigate salacious allegations about his actions with Russian prostitutes.