Secretary of State Marco Rubio said the United States attacked Iran over the “imminent” threat posed by an Iranian response to an Israeli attack that the U.S. knew was coming.

The Trump administration gave out a flurry of explanations for the largest U.S. combat operation since the 2003 Iraq War on Monday, following the Saturday morning attack. Speaking with reporters, Rubio claimed the danger posed by an Iranian response was too great to sit out of any attack, which was bound to come from Israel anyway.