Not so presidential: Donald Trump and Bill Clinton trade taunts

In 2008, Donald Trump, Bill Clinton and Billy Crystal play golf at Trump National Golf Club in Briarcliff Manor, N.Y. It's been called the world's most exclusive fraternity: the men who have served in the Oval Office. Out of respect, members largely avoid criticizing one another, regardless of political party.

Once upon a time, when Bill Clinton needed a golf haven, he turned to Donald Trump

JULY 14: Rudolph W. Giuliani, Donald Trump, Bill Clinton, and Billy Crystal attend the 2008 Joe Torre Safe at Home Foundation Golf Classic at Trump National Golf Club on July 14, 2008 in Briarcliff Manor, New York. In 2000, when Hillary and Bill Clinton were looking to relocate from Washington, D.C. to Westchester County in New York, I was the local golf writer for Westchester's daily newspaper.