>> we need a firm international response in order to avert that chemical attack take place in the future. it would send a very, i would say dangerous signal to dictators all over the world if we stand idle by and don't react. >> many lawmakers, in fact, a lot of people want more details about the evidence of this chemical weapons attack, in particular, who carried it out. that's also what the president plans to do in syria. one of those people wanting answers is our guest. >> she was at that classified briefing yesterday to congresswoman, thank you for joining us. 80 members of congress came