and would you consider a small-scale chlorine attack sufficient to launch additional strikes? >> right now i'll just tell you we're in close consultation with our allies. we review all the evidence all the time. it is difficult, as you know, to get evidence out of syria. but right now we have no additional attacks planned. as far as the legal authority under the article ii of the constitution, we believe the president has every reason to defend vital american interests. >> what were some of the targeting considerations or difficulties involved in going after chemical facilities? how long did the operation take the plan? and last year's strikes were described as proportional, moderate. how would you describe this year's in contrast to that? >> we chose these particular