But a team of Marines and Special Forces that helicoptered in has reported back that, with a corridor off the mountain opened up by U.S. air strikes, the humanitarian crisis is over. The few thousand who remain can be airdropped food and water. The rest can be brought out.

The emergency over, President Obama should think long and hard about launching a new air war in Iraq or Syria. For Iraq War III holds the promise of becoming another Middle East debacle, and perhaps the worst yet.

America would be entering this war utterly divided. We are not even agreed on who the enemies are. Hillary Clinton thinks we should be tougher on Iran and that Obama blundered by not aiding the Syrian rebels when they first rose up to overthrow President Bashar Assad.

Veteran diplomats Ryan Crocker, William Luers and Thomas Pickering argue that Assad is not the real enemy. The Islamic State is, and we should consider a ceasefire between the Free Syrian Army and Assad.