Goss fears WMD attack in U.S. 'a matter of time' By Bill Gertz THE WASHINGTON TIMES Senior U.S. intelligence leaders told Congress yesterday that "it may only be a matter of time" before terrorists try to use weapons of mass destruction against the United States. In his first public appearance since becoming CIA director in September, Porter J. Goss used the annual worldwide threat hearing to issue the prediction, while another federal official said the FBI knows little about al Qaeda sleeper cells such as the September 11 terrorists. "It may be only a matter of time before al Qaeda...