Legendary Republican operative Roger Stone claims in his new book that Lyndon Johnson arranged John F. Kennedy’s assassination, and that Richard Nixon and Johnson had a documented relationship with Lee Harvey Oswald’s killer, Jack Ruby, years before Ruby shot Oswald in the basement of Dallas police headquarters in 1963.

Stone, who worked for Richard Nixon’s Committee to Re-elect the President in 1972 and later served in the Nixon administration, claims in his forthcoming book that Johnson, then a congressman, instructed Richard Nixon, then a congressman, to hire Ruby on the House of Representatives payroll in 1947.