Potential assassins have threatened the life of Jimmy Carter multiple times since he left the White House in 1981, making the one-term Georgian the most threatened former president in history, according to a new book about John F. Kennedy and his assassination 50 years ago.

In "The Kennedy Half Century: The Presidency, Assassination, and Lasting Legacy of John F. Kennedy," Carter told author Larry J. Sabato that he has faced at least three home-grown assassination attempts since returning to Georgia and is constantly warned by the U.S. Secret Service of personal threats during his frequent overseas travel.

"I have had two or three threats to my life after I came home from the White House," Carter said in the highly-anticipated book due out October 22. "When I go on an overseas trip almost invariably, I get a report from the Secret Service that where I'm going is very dangerous," he added in the book provided in advance to Secrets....