Administration officials say they remain committed to a diplomatic solution to ensure Iran does not obtain nuclear weapons. But they will not rule out military action as an option, even as they try to tamp down talk about military planning. "I know here in Washington prevention means force," President George W. Bush said Monday. "It doesn't mean force, necessarily. In this case, it means diplomacy," the president added, calling recent newspaper and magazine reports about US military planning on Iran "just wild speculation."