A key House Republican Thursday called for a hearing to investigate a Department of Homeland Security report that highlights security risks posed by extremist groups and disgruntled veterans. Rep. Peter King (N.Y.), the ranking Republican on the House Homeland Security Committee, has asked for a hearing into the matter, one day after the committee Chairman Bennie Thompson (D-Miss.) said he was “dumbfounded” by how the agency could release such a report. DHS Secretary Janet Napolitano, who has endured a barrage of congressional criticism over the report, on Thursday made the rounds of the morning news programs, appearing in five interviews...