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Seven Days in May is a political thriller novel written by Fletcher Knebel and Charles W. Bailey II and published in 1962. It was made into a motion picture in 1964, with a screenplay by Rod Serling, directed by John Frankenheimer, and starring Burt Lancaster and Kirk Douglas.

The story is said to have been influenced by the right-wing anti-Communist political activities of General Edwin A. Walker after he resigned from the military. The author, Knebel, got the idea for the book after interviewing then-Air Force Chief of Staff Curtis LeMay.

President John F. Kennedy had read the novel and believed the scenario it described could actually occur in the United States. According to director John Frankenheimer in his director's commentary, production of the film received encouragement and assistance from Kennedy through White House Press Secretary Pierre Salinger, who conveyed to Frankenheimer Kennedy's wish that the film be produced and that, although the Pentagon did not want the film made, the President would conveniently arrange to visit Hyannis Port for a weekend when the film needed to shoot outside the White House.

http://en.wikipedia.org/wiki/Seven_Days_in_May

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