O'Reilly to George Will: 'You're a hack!'

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Fox News' Bill O'Reilly' defended his new book Friday by attacking one of its fiercest critics as a "hack" and a secret member of a "cabal" that wants to "deify" America's 40th president, Ronald Reagan.

The book, Killing Reagan, which claims that the failed 1981 assassination attempt on President Ronald Reagan triggered his mental decline, has drawn sharp criticism from several historians.

Among those who've had sharp words for of O'Reilly's latest offering is syndicated columnist George Will, who wrote this week that the book's, "perfunctory pieties about Reagan's greatness are inundated by its flood of regurgitated slanders about his supposed lassitude and manipulability."

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