Trump would not say Wednesday whether he has decided to order a U.S. strike on Iran, a move that Tehran warned anew would be greeted with stiff retaliation if it happens.

President Donald Trump is now seriously weighing U.S. military action inside Iran while the country's supreme leader says his nation will not surrender.

Israel escalated its bombings across Iran on Monday, striking Iran’s elite military force and the nation’s state broadcaster and sending thousands fleeing from Tehran, as its offensive entered its fourth day and showed no signs of slowing.