online, et cetera, to determine that full extent of his communication and his circle. secondly, they're looking backwards. they're looking at who he was, who -- where he may have traveled and why. what was his motivation? how was he in fact inspired? those things are both happening simultaneously. and it is happening with the full resources of the fbi and other partners in the federal government. >> all right. shawn henry, thank you so much. we appreciate it. you talk to retired head of the fbi who told you that if you knew all the intel he saw, you wouldn't be able to sleep at night. that it's coming in from all angles. of course we're in new era that is even more frightening here. we have a shooter that had no known terror background, no known terror connections, maybe something comes up later. but the lean wolf presents an even more frightening challenge for our government.