Former US President Bill Clinton expressed opposition to attacking Iran over its nuclear program, saying sanctions are working better than people think and questioning whether a military strike would work. Clinton said Friday the United States could not be sure that a military strike would destroy Iran's nuclear program, and he noted that Iran's population is three times larger than Iraq's. The former president made his comments in answer to audience questions following a 45-minute lecture on the Kansas State University campus attended by about 9,000 people. His remarks touched on a wide range of topics, including the need to improve health care and the economy in the United States and alleviate poverty abroad. "We should be talking to the Iranians," Clinton said. "Attacking them is a whole different kettle of fish."