What should be done with a man who infiltrated the terrorist group Hamas, spied for Israeli intelligence and broke up terror attacks, saving countless Israeli, as well as Palestinian, lives? Most people would say he should be honored. Not the U.S. government, it's trying to deport him. Mosab Hassan Yousef was more than a spy. He is the son of a founding leader of Hamas, which made him among the highest prizes for Israeli intelligence. Yousef and his Shin Bet (Israel Security Agency) handler, Gonen Ben Itzhak, were in Washington last week, meeting with whoever would listen to them. Yousef...