ISIL has largely taken over control of a huge camp in northeast Syria, and there’s no plan for what to do with the 70,000 people there (including more than 50,000 children). The United States and Europe must immediately address this urgent national security and humanitarian crisis, before a new caliphate is established while we watch. After the fall of Raqqa and the coalition defeat of ISIL’s strongholds, President Donald Trump announced that “100 percent” of the caliphate had been destroyed. But the tens of thousands of ISIL fighters and family members left over were herded into massive fenced internally displaced...