(CBS) Mullah Dadullah is the Taliban's most bloodthirsty commander, and there are few people in the world the U.S. wants to capture more than him, CBS News chief foreign correspondent Lara Logan reports. In an exclusive interview filmed for CBS News on the Afghan-Pakistan border, the one-legged leader promises to go beyond the battlefields of Afghanistan and hunt down Americans at home. "Even if they go back to America, we will have to take revenge," he says. "America has humiliated our country and our people. We will never negotiate." MORE ON THIS STORY