pose to not only u.s. interests abroad but to the homeland itself? >> it's not uncommon for most of these jihadist leaders wherever they are, north africa, iraq, pakistan to make these comments about the united states. the u.s. is the great satan for many of these groups. the question is how many evidence do we see against the u.s. the concern is we have seen a growing use of networks for fund-raising and recruitment into europe. there was an assassination recently in brussels by someone trained by isis in syria. there are growing concerns about the external operations capability of baghdaddy and his organization. >> how many american fighters do we think there are fighting with isis? >> i would say we don't have great numbers right now. estimates have put this at maybe over 100 americans. that's fighting for a number of different organizations. probably in the dozens at most