chemical weapons. there are big questions still about chain of custody, perhaps command and control and how decision-making is being made within the syrian military. so i think we're not perhaps at a point where we can draw far-reaching conclusions. and of course, there are the los of other red lines that have been crossed. war crimes, crimes against humanity, usage of chemical weapons is a very important international norm, and it needs to be protected. but i don't think we should see this an isolation as the linchpin that should shift u.s. policy and u.s. strategy. >> although we should say so more recently now when you have the senior -- the suspicions now that chemical weapons have been used, the president sort of clarified, maybe even moved the goalposts a little bit, i think this was a week or two ago where he said now it's the systematic -- the systematic use of chemical weapons on civilian populations. so he's sort of qualifying it. and the feeling i'm getting listening to this is basically this is a guy who does not want to be intervening and is looking