In recent years, a more active and aggressive Congress has often sharply disagreed with the president over the ends and means of American foreign policy. The normal tensions that arise in the U.S. system of separate institutions sharing power have been exacerbated by the contemporary pattern of split-party control of the two branches. The ensuing conflict in areas ranging from Central America to China has stimulated a spirited debate about the constitutional authority and institutional competence of the president and Congress to make foreign policy. In this volume, noted authors, led by Thomas Mann, examine executive-legislative relations in five major policy areas: war powers, intelligence, arms control, diplomacy, and trade. They offer a fresh analysis of the sources and consequences of conflict between the President and Congress as well as constructive suggestions for strengthening each branch’s comparative advantages.