Sure. I think that the main threat to the United States and Canada does come from the citizens of North America who went and travelled to Iraq or Syria, continue to hold passports, and can return. I think that this presents a different set of challenges from the ones that I highlighted as kind of the high-level issues about what makes ISIS a particularly potent and difficult adversary to deal with through some traditional terrorist finance instruments.
I think that, in terms of the returning volunteers who have travelled to Iraq and Syria, the previous witnesses are correct that this isn't incredibly expensive, that there are domestic sources of funding, oftentimes, that tend to be very grassroots within the communities that they come from, often within mosques and other areas. I think this is, essentially, a set of law enforcement or intelligence questions, but I think it is correct to say that the main threat probably doesn't come from a 9/11 style of attack, if you will, but rather people who are currently being radicalized within Canada or the United States and their ability to get training and funding from ISIS or other groups in Iraq and Syria.