U.S. concerns about ISIS comeback in Syria

Syria is at a crossroads in the wake of Bashar al-Assad's fall, with fears persisting that ISIS could use the collapse of the regime, and a potential power vacuum, to stage a comeback. CBS News senior foreign correspondent Holly Williams has more.

U.S. concerns about ISIS comeback in Syria
Syria is at a crossroads in the wake of Bashar al-Assad's fall, with fears persisting that ISIS could use the collapse of the regime, and a potential power vacuum, to stage a comeback. CBS News senior foreign correspondent Holly Williams has more.