How great of a threat does ISIL pose to the US?

Friday - 8/22/2014, 9:14am EDT

"The immediacy is in the number of Europeans and other nationalities who have come to the region to be a part of that ideology," said Joint Chiefs Chairman General Martin Dempsey. He made the comments while discussing the strength of ISIL in Syria and Iraq. The immediate problem for the U.S. he says is that some of those foreign fighters which came from the U.S. may have already gone home.