nbc news national security analyst and former director of the national counterterrorism center, michael leiterin boston, nbc news national investigative correspondent michael isikoff. michael isikoff, start with you and what they got out of these persons of interests' homes and out that i have possession, including the computer which could be a treasure atroptrove information? >> right. that would have been all of the evidence in that dorm room of tsarnaev and probably be the one of most interest to the fbi because it would let agents trace who he has been in communication with, who he has been e-mailing with, what web sites he has been looking at before the bombing and would reveal the most information about whether they were accomplices. i think it's worth noting this affidavit is a little confusing in some respects because it details how these three men went to the apartment that night. they took the backpack and they say they took the laptop computer and then it's silent about what happened to the laptop computer. it describes how the backpack was thrown away in the trash. and that the fbi

. >>> joining me here in studio is michael leiter, nbc news terrorism expert and the former director of the national counterterrorism center. the president said that all of these years after 9/11, that it's time to move on and redefine this. and in fact, focus on the current threats, the lone wolf, boston, what we saw happen in london. but how, how is he redefining it? we've yet to hear more about exactly what the new strategy is going to be going forward. >> i think the president really did do a very good thing by trying to give some context. the threat has changed. it's evolved. and we face a very different level of threat from pakistan and elsewhere overseas. and as you said, the home-grown threat has gotten worse over the past four or five years. he talks a lot about using our elements of national power. so making sure he can still use drones, making sure that we're engaging overseas. but then also trying to reduce the attraction of the ideology. frankly, beyond that, he doesn't give a lot of detail about how programs will change. how budgets will change. and i think that's the t