The Daily Rundown 08/26/14

Are European extremists biggest ISIS threat?

As the U.S. prepares options against ISIS in Syria, there is a growing fear that westerners who have joined ISIS could target the U.S., but is the biggest threat actually from European extremists? NBC’s Ayman Mohyeldin and Nora Bensahel from the Center fo ... more Duration: {{video.duration.momentjs}}