carry out lethal attacks in the united states are u.s. citizens or legal permanent residents. i'm not sure what the status of this guy is exact but he was here legally under this visa program. so the problem is stopping people radicalizing here. you can't stop the internet. the people are from all around the country. they don't fit any particular ethnic profile. it's a tough thing. the people who know the most are peers and family members. the fbi has done a study of this in a lot of cases. peers are reluctant to come forward. family members reluctant to come forward. strangers are eager to come forward but they don't know much. enlisting these people that say if you see signs of radicalization or signs of plot planning, which peers and family members may well see. >> chief ramsey if you're still with us, senator lindsey graham today said they should try him as enemy combatant and send him