WASHINGTON — The United States on Saturday conducted major combat operations in Iran to safeguard Americans from "imminent threats" from Tehran, President Donald Trump said, following Washington's massive military buildup in the Middle East and a struggle to reach a nuclear deal with the Islamic Republic. Trump made the announcement in a video clip posted on Truth Social, saying the U.S. military is conducting a "massive and ongoing" operation to prevent the "very wicked radical dictatorship" in Iran from threatening American and its core national security interests. "A short time ago, the U.S. military began major combat operations in Iran. Our objective is to defend the American people by eliminating imminent threats from the Iranian regime -- a vicious group of very hard, terrible people," Trump said. "Its menacing activities directly endanger the U.S., our troops, our bases overseas and our allies throughout the world," he added. He reiterated that Iran will never have a nuclear weapon, while stressing that the U.S. military will totally "obliterate" Iran's missiles and missile ind