Donald Trump has announced that the United States could carry out another military campaign against Iran. The statement frames a fresh operation as a real possibility rather than loose talk. He gave no timeline and no details about its scale or targets. Any new campaign would follow the strikes the US already conducted against Iran earlier this year. Against that background, the announcement carries weight instead of sounding like routine rhetoric. Tehran's response, and whether diplomacy can head off another round of fighting, remains an open question. For now the message from Washington is that the military option stays on the table.