banking system, they're avoiding the internet. and they're certainly not seeking day-to-day orders back in raqqah, which makes this extraordinarily difficult to get at these people. you know, i just sympathize with the french and the europeans in general. and for that matter, the federal bureau of investigation. they know what they're up against. and it's more than lone wolves. it's really worrisome. and the fact that these people were so good, you know, i've watched these videos on the trigger. i mean, they clearly have been in combat. they know what they're doing. and making six vests go off with tatp is extraordinary. you ask any explosives person and to make that work is not easy to do. it's something you don't learn on the internet. >> just to echo what bob was saying i spoke to a senior u.s. law enforcement official earlier today and he said the two big issues here. one is going dark. you know the difficulty of tracking and surveilling these communications. the other is simply volume. it's the volume of the refugees coming across the border.