Attorney General Alberto Gonzales has apologized to U.S. attorneys under him and appointed an interim chief of staff as pressure builds for him to resign. Gonzales apologized to all 93 U.S. attorneys in a conference call Friday as morale in U.S. attorneys' offices across the country deteriorated, McClatchy Newspapers reported. Gonzales has been at the center of a controversy over the way in which eight U.S. attorneys were fired in recent months