week. >> in this particular case people i've talked to in the white house say this issue of congressional authorization was always on the table, that obama and his counsel were always concerned about a legal justification for doing this and they felt more politically isolated. so it's not like it came out of nowhere but they did buck the system. >> one thing they did here is set a precedent. you first peter and then again you david quickly. it seems like they're saying when it comes to a matter that doesn't directly affect an imminent assault or attack in the united states you need congressional approval for something that involves an international norm like chemical weapons use. it seems to me that sets up the premise for six months or a year if now we have to make a decision about what to do with if the mullahs decide to weaponize their nuclear program over in tehran. doesn't that set up a predicate now where he has to go to congress? >> i think that's a very good point. he says i reserve the authority to do this without congress. i don't need to go to congress. but i'm going to anyway. and it's hard to say why a future scenario like the one you