The Executive Branch and Congress have constitutional responsibilities for U.S. foreign policy, and within the Executive Branch, the Department of State is the lead U.S. foreign affairs agency. The Department of State plays the primary role in leading interagency coordination in developing and implementing foreign policy; manages foreign affairs resources; leads and coordinates U.S. representation abroad; conducts negotiations and concludes agreements and treaties on issues ranging from trade to nuclear weapons; and coordinates and supports international activities of other U.S. agencies and officials.