People gather at the scene of a massive explosion outside the foreign ministry in a residential area close to the Green Zone in central Baghdad yesterday. (PHOTO CREDIT: ALI AL-SAADI/AFP/Getty Images) FROM CNN's Jack Cafferty: The increasing violence in Iraq is raising new questions about the withdrawal of U.S. troops. Insurgents launched six-bombings that struck … Continue reading How should U.S. respond to escalating violence in Iraq?