The top U.S. commander in Afghanistan insists the military can boost Afghan security forces to fight the Taliban, begin a troop drawdown this summer and fulfill President Barack Obama's goal of a long-term partnership with the Kabul government. Facing a skeptical Congress and a war-weary public, Army Gen. David Petraeus is trying to build support for the continued and costly U.S. involvement in Afghanistan, telling lawmakers the conflict is turning around despite concerns about the viability of President Hamid Karzai's government and the dedication of neighboring Pakistan to root out terrorism. The general testifies before the House Armed Services Committee on Wednesday. His first day of Capitol Hill testimony Tuesday came as a new Washington Post-ABC poll found that nearly two-thirds of Americans consider the war no longer worth fighting. He acknowledged the growing opposition. "I think it is understandable that the American people could be frustrated that we've been at this for 10 years and, you know, we haven't won yet," he said.