Few people inside the administration knew the president was moving forward with plans for the attack, even late last week.

President Donald Trump’s order to bomb Iran’s nuclear facilities presents a new test of the Constitution and the extent of presidential powers to conduct war despite a lack of congressional approval.

Trump announced on Saturday that the United States had completed a “very successful attack” on Iran’s key nuclear facilities — including Fordo, Natanz and Isfahan — in a post on his Truth Social platform. He wrote that a “full payload of BOMBS” were dropped, and U.S. planes were safely on their way home.