CNN The Situation Room December 15, 2014 23:38:00
Up, there's not much they can do. >> peter bergen, you spent a lot of time studying terror threats to the united states. how worried should the u.s. be about a copy cat attack? >> i think the concern that we see are people becoming self-radicalized in countries that we live in. in the case of syria, 12 americans have gone to join can al qaeda. two of them are dead. people go there, they don't know how to fight. but people are self-radicalizing, and we've seep that in canada and australia, and to some extent in the united states. at the end of the day, even that suspect that big an issue. there...