Former Presidents Look to One Another For Advice, Friendship

The five living American presidents have come together to uphold a modern tradition begun by Herbert Hoover and Harry Truman: A team born from the U.S.'s highest executive office. Nancy Gibbs and Michael Duffy write about its secrets in their new book, "The Presidents Club: Inside the World's Most Exclusive Fraternity."

The five living American presidents have come together to uphold a modern tradition begun by Herbert Hoover and Harry Truman: A team born from the U.S.'s highest executive office. Nancy Gibbs and Michael Duffy write about its secrets in their new book, "The Presidents Club: Inside the World's Most Exclusive Fraternity."

The five living American presidents have come together to uphold a modern tradition begun by Herbert Hoover and Harry Truman: A team born from the U.S.'s highest executive office. Nancy Gibbs and Michael Duffy write about its secrets in their new book, "The Presidents Club: Inside the World's Most Exclusive Fraternity."