Hillary Clinton
U.S. Secretary of State Clinton attends a news conference after the 19th ASEAN Regional Forum Foreign Ministers Retreat in Phnom Penh on July 12, 2012. REUTERS

U.S. Secretary of State Hilary Clinton has threatened to use all elements of American power against Iran to prevent it from developing a nuclear weapon.

Clinton, on a visit to Israel, added that proposals made by Tehran so far were nonstarters.

Iran's leaders still have the opportunity to make the right decision, she said. The choice is ultimately Iran's.