you had to process people. you're right, there were a lot of threats, and we worked very hard to minimize those threats and you try to balance it. every once in a while the bad guys sneak one in on you. this is an example of that. it wasn't any lack of attention to find those cells. we're looking hard for them and we did find a number, and we did, in fact, which i can talk about in closed session, stop those attacks from occurring. this one we were not successful. >> speaking of that, the taliban was controlling the checkpoints, obviously, around the airport. and you old indicated, general mckenzie, that the u.s. at the time -- you called it a pragmatic relationship of necessity with the taliban. did we share any information with the taliban about the isis-k threat? and if so, how did the taliban respond to it? in other words, how did they get in? the it possible they let them in on purpose? >> so, it is possible they did but the body of intelligence indicates that is not, in fact, what happened.