In my opinion, there are two wars going on with regard to ISIS. One is a war on the ground for territorial control, which we heard about this morning. The other is what we'll call “the war over jihadist principle”. That's the intention of ISIS, and it's in their public documents. The intention is to establish or re-establish a caliphate, not just in Iraq and Syria—which, by the way, are the territories of the original Abbasid caliphate—but globally. That war, we're not fighting with aircraft and troops on the ground. We have to fight with ideas. We have to find and support our colleagues within the world of Islam—who, by the way, are also threatened and targeted—to work together to defeat the threat to all of us.
On May 5th, 2015. See this statement in context.