no b sevens, that it defeats a lot of the systems that we have. how can we detect, how can we vent the weapon because the weapon is a mind, who was recruiting, who was radicalizing, are we good at venting? that question is asked in europe and now it's asked here. >> tucker: yeah, it does seem like a fence like this ad residence to the idea of who should be let in, anyone who wants has a moral and legal right to come up here, it rubs up against us in some ways, doesn't it? >> i would tack on to what dr. phares was just saying, this attack was right out of the playbook. normally in attack like this you have to go out hunting for clues about the perpetrator. in this case it's right in our faces. isis is literally instructed its worst weapon eyes vehicles, to carry out attacks and very public places for maximum sort