number of them before their arrest traveled to ukraine, traveled to italy, traveled to celebrate adolf hitl hitler's birthday in germany so i suspect when people leave the country, there are tools available to monitor their activity, but how does it -- how is this different from an international terrorist organization in terms of coordinating or sharing across are government agencies? >> it ends up being a complicating factor. to be honest, that would have been true even if you were talking about sharing of information on u.s. nationals in the context of international terrorism. for example, i used to point to this as a little bit of a silver lining of the isis experience. there weren't many silver linings in the isis experience. one silver linings is it caused u.s. agencies and departments to be more willing to be sharing with our foreign partners overseas about our own population of foreign fighters. we certainly needed that reciprocal cooperation from them. when we had cases involving u.s. nationals traveling to fight for isis or travel to the conflict zone in iraq or syria, that was information