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By Patricia Zengerle and Matt Spetalnick WASHINGTON (Reuters) - President Barack Obama wants to roll back some of the most controversial aspects of the U.S. "war on terror," but efforts to alter the global fight against Islamist militants will face the usual hurdle at home: staunch opposition from Republicans in Congress. In a major policy speech on Thursday, Obama narrowed the scope of the targeted-killing drone campaign against al Qaeda and its allies and announced steps toward closing the Guantanamo Bay military prison in Cuba. He acknowledged the past use of "torture" in U.S. ...