people using social media to communicate with groups. we're not matching up relatives in these investigations and offspring of them. >> do we have shot of stopping domestic terrorism? >> you can't eliminate it. you can build partners to provide you with the information you need. we need a public to identify extremism beyond picking up a gun going to shoot someone. we have to face the reality this radicalization process happens very quickly. you have to defeat this group overseas. isis' success overseas is interpreted by radicals as endorsement and that draws them to this group. if you want to secure the homeland, you have to push isis back overseas. >> okay. fair enough. you point out that maybe it's -- it needs to be -- do we profile?