Iran retaliated against the U.S. on Monday, launching missiles at a U.S. base in Qatar, according to a statement from the Qatar foreign ministry. The missiles targeted Al-Ubaid Air Base outside Doha and were intercepted by air defenses before they could strike the base, the Qatari government said.

The Pentagon already had begun taking measures to strengthen its firepower in the Middle East and protect U.S. bases there.

President Trump said Monday the Iranian government offered "early notice" about a series of missile strikes that targeted the U.S. Al Udeid Air Base in Qatar, downplaying Iran's response to the U.S. bombing of some Iranian nuclear sites over the weekend as "very weak."