Bill O'Reilly is out with a new book, Killing Reagan: The Violent Assault That Changed a Presidency.
In the book, O'Reilly claims that Ronald Reagan's declining mental abilities started just two months into his presidency after he was shot by John Hinckley Jr.
George Will considers the claim absurd.
O'Reilly and Will had it out on O'Reilly's show about it: Bill O'Reilly vs. George Will: 'You're A Hack! You're A Liar!'
Will's review that is driving O'Reilly crazy is here: Killing history: Bill O’Reilly’s shoddy Reagan book.