u.s. be there to close ranks with them. what would happen as far as the u.s. is concerned? >> only president obama makes that decision. if there were a attack on nuclear facilities, it would be complicated and difficult. it would successful but not surely successful. what would happen after that kind of attack, iran retaliates. do they close the strait of hormuz. do they unleash assassin squads. there are scenarios that may unfold but the fact, the way i think about iran and nuclear weapons program, some people have said, don't worry about it, we'll have plenty of time once iran makes the decision to have nuclear weapons. you won't have plenty of time. because iran is getting the capabilities now to enable it to make that decision. once they make that decision time will run out. >> shannon: k.t., thank you so much measure.