terror groups, there are a lot of them, not just isis and al qaeda, are competing with each other, is this now suddenly trigger a serious of continuous an chronic terrorist attacks? what does that mean for american citizens? >> gregg, what really this is doing, it is making more vivid what we've known for quite a while. we've had al qaeda in arabian peninsula. al qaeda in the islamic maghreb. boko haram,al that bob and isis and affiliates join up. they compete with each other. sometimes they cooperate with each other. they have transient alliances. this makes much more difficult back on september 11th, when it was one group in caves in afghanistan. gregg: switching to our other subject which we initially invited you, we have this isis videotape threatening an attack on the white house. it came 24 hours after a simulated video attack on new york city. how serious do you take this?