John F. Kennedy was so concerned about his wife meeting notorious ladies’ man Aristotle Onassis that he ordered her Secret Service bodyguard to keep her away from him, a new book has claimed.

Clint Hill was assigned to protect five presidents through the course of his career – looking after the safety of Eisenhower, Kennedy, Johnson, Nixon and Ford.

And in his memoir, which was published on Tuesday, Mr Hill, now 84, told how he was ordered to steer Mrs Kennedy away from the Greek shipping tycoon.