level, which i don't think is an incentive for us to capitalize on. the impact if it is minimal, we should separate the two efforts. we should be asking what should america be doing in afghanistan and focusing somewhat on the troop numbers, but what is legitimate for our american interests and not get caught up in a mission that keeps us there forever. >> the question lisa, balancing our national security, national interest and the costs. we're spending $100 billion a year in afghanistan. we have 100,000 troops there. meantime by ougall accounts the is just 100 al qaeda fighters remaining there. is it worth or blood and treasure to stay? >> absolutely. stabilizing afghanistan means protecting u.s. national security interests. we all know that 9/11 originated because the taliban were in control of afghanistan. they allowed it to be an