Federal Emergency Management Agency Director Michael Brown, the principal target of harsh criticism of the Bush administration's response to Hurricane Katrina, was relieved of his onsite command Friday. He will be replaced by Coast Guard Vice Adm. Thad W. Allen, who was overseeing New Orleans relief, recovery and rescue efforts, Homeland Security Secretary Michael Chertoff announced. Earlier, Brown confirmed the switch. Asked if he was being made a scapegoat for a federal relief effort that has drawn widespread and sharp criticism, Brown told The Associated Press after a long pause: "By the press, yes. By the president, no." "Michael Brown...