they have never conducted an international operation. they would want to do something to hurt at lot of chinese. their style in the past couple of months has been knife attacks. it's not just that some of them are islamic extremists. it is also a nationalistic ethnic dispute with china. it goes back hundred of years. it doesn't seem to fit the pattern of the uighurs. there's not evidence that would have helped us on this. that means going through the passenger manifest with a fine-toothed comb. >> all right, ambassador. you've been the american ambassador to the united nations. isn't there a protocol in the situation like this, i mean, do we rely on the country that may not have the capabilities to invite us in. can we force our way in? >> well, i think you have to go in -- not just because it is the united states. but as you say, we have the