Republican presidential front-runner Donald Trump continued his call for surveillance of "certain" U.S. mosques — at one point supporting his case by recounting how he witnessed "thousands and thousands of people" cheering in Jersey City as the Twin Towers fell on Sept. 11, 2001. "Hey, I watched when the World Trade Center came tumbling down," the billionaire businessman and former Atlantic City casino tycoon said during a rally in Birmingham, Ala., according to video of the Saturday event. "And I watched in Jersey City, N.J., where thousands and thousands of people were cheering as that building was coming down. Thousands...