New one here...
Perot's real problem with McCain is that he believes the senator hushed up evidence that live POWs were left behind in Vietnam and even transferred to the Soviet Union for human experimentation, a charge Perot says he heard from a senior Vietnamese official in the 1980s. "There's evidence, evidence, evidence," Perot claims. "McCain was adamant about shutting down anything to do with recovering POWs."

http://www.newsweek.com/id/94827