The Situation Room gathering with top military and intelligence advisers lasted about 80 minutes and there was no immediate statement from the president.

Trump has already issued a chilling death threat to Iran's Supreme Leader, Ayatollah Ali Khamenei, revealing the U.S. knows his precise location and that he is an 'easy target.'

Four U.S. B-52 Stratofortress bombers are now stationed at the Diego Garcia base in the Indian Ocean, within striking distance of Iran.

The B-52s, which can carry nuclear weapons or other precision-guided bombs, were spotted on a runway at Diego Garcia on Monday.