WASHINGTON — The United States is limiting its goals in Afghanistan and demanding better accountability from that country’s underperforming leader, Secretary of State Hillary Rodham Clinton said Sunday, and she tied additional U.S. civilian help to results from Kabul.

Clinton, an influential voice in deliberations about whether to add large numbers of U.S. troops to an unpopular 8-year war, said Afghan President Hamid Karzai can do more to reduce corruption and go after those who may have looted U.S. aid in the past.