conduct foreign policy. not only is this a difference of policy but this is a fundamental misunderstanding about how the system works and who is responsible for the conduct american foreign pellolicy. >> explain why you think this is a misunderstanding of foreign policy. the constitution does give congress a right in certain areas. >> absolutely. congress has an oversight role. but in terms of the negotiation of agreements that's something that the president leads. we have agreemented eds that give our troops protections they need in afghanistan, the security agreement, at greedthe agreement to remove chemical weapons. these are things the president negotiates. congress has an oversight role to play. to insert themselves a negotiation to prevent this from getting reached, that's harmful. it's important to remember it's not just the united states in the negotiating table. it's the united states the u.k.