Top U.S. counterterrorism officials say they worry a potential terrorist could be hiding among refugees who are looking to come to the United States after escaping the brutal war in Syria. "It's clearly a population of concern,” the director of the National Counterterrorism Center, Nicholas Rasmussen, told the House Homeland Security Committee on Wednesday. Committee Chairman Mike McCaul, R-Texas, went further, saying it would be a “huge mistake” to bring refugees from the conflict to the U.S. – even as an estimated 4 million children, women and men have been forced to flee Syria and another 7 million have been...