We have this unfortunate habit in the United States of dividing terrorism into different categories. External, foreign terrorism, which manifests itself overseas or in the United States, or domestic terrorism.

When we use the word domestic [terrorism], we discount its actual impact as political terrorism, which is, of course, political violence meant to impact an audience outside of the immediate victims.

ISIS is going to devolve from physical political emirate, into what Al Qaeda was, which is a covert organization which will go completely underground. But to communicate and to keep propagating their propaganda, after everyone is dead, all their fanboys and whatever surviving leadership that has been operating outside the war or operates in Somalia, Yemen, and Afghanistan, they will form what we call a "ghost caliphate."

The ghost caliphate will be a virtual organization; it'll be decentralised, with no leadership, and it will just encourage people to keep acting now that the caliphate's gone, that individuals should go do self-starting jihad. Get a gun, get an improvised weapon, take your car, and carry out the jihad.

You can`t differentiate between an Islamic terrorist and a Christian terrorist. Or a politically motivated terrorist who`s anti-abortion or someone who may have differing views.

Most ISIS members are irreconcilable. Once they've bitten that bug, that cultish bug, they would prefer to die. They're going to be given the opportunity, no one's going to get out alive from Iraq and Syria now. They make sure everyone's a suicide bomber now.

We have this unfortunate habit in the United States of dividing terrorism into different categories. External, foreign terrorism, which manifests itself overseas or in the United States, or domestic terrorism.