The U.S. State Department on Sunday issued a "worldwide caution" alert for Americans traveling abroad, after President Donald Trump announced the U.S. had struck three nuclear sites in Iran. "The conflict between Israel and Iran has resulted in disruptions to travel and periodic closure of airspace across the Middle East,

"We are leaving it to the decision of the head of, the president of the United States and his team, because it had to do with America's national security interest, period," he said Sunday.