Obama says he's not bluffing on Iran military option

WASHINGTON/OTTAWA (Reuters) - President Barack Obama issued his most direct threat yet of U.S. military action against Iran if it builds a nuclear weapon, but in a message to Israel's leader ahead of White House talks he also cautioned against a pre-emptive Israeli strike. "As president of the United States, I don't bluff," Obama warned Iran in a magazine interview published on Friday, three ...