Questions

Iran that Tehran could use" for weapons-related activities.

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The International Atomic Energy Agency did not respond to a request for comment about Iran possibly moving nuclear material. The head of the U.N.'s nuclear watchdog said he will convene an emergency meeting of the Board of Governors on Monday.

Global leaders responded with shock and calls for restraint. The United Nations Security Council scheduled an emergency meeting on Sunday. Egypt warned of "grave repercussions" for the region. Bahrain, home to the U.S. Navy's Middle East-based Fifth Fleet, called on Iran and the U.S. to "quickly resume talks."

Trump's decision and the risks

The decision to attack was a risky one for Trump, who won the White House partly on the promise of keeping America out of costly foreign conflicts.

But Trump also vowed that he would not allow Iran to obtain a nuclear weapon. He initially hoped that the threat of force would bring the country's leaders to give up its nuclear program.