“Would the U.S. respond?” ABC News Chief White House Correspondent Mary Bruce asked repeatedly as the president walked away after the end of an unrelated event. He paused, thought for a moment and then returned to the lectern.

“We are devoted to the defense of Israel. We will support Israel. We will help defend Israel and Iran will not succeed,” he said.

According to one U.S. defense official, the assets being moved to the region include both “ships and aircraft.”