President Bush’s revised plan to interrogate and prosecute terrorism suspects has received a major setback on Capital Hill. On Thursday, the Senate Armed Services Committee passed an alternative plan affirming Common Article 3 of the Geneva Conventions, which prohibits inhumane treatment. Four Republicans, including Arizona’s John McCain and committee chair John Warner, joined Democrats in approving the measure. The White House says it will fight the legislation because it would mean the end of the CIA’s program of interrogating detainees. The Senate measure received a boost Thursday from former Secretary of State Colin Powell. In a letter to Senator McCain, Powell said ignoring the Geneva Conventions would endanger US troops and imperil the war on terror. Powell said: “The world is beginning to doubt the moral basis of our fight against terrorism.”