From the first days of the Republic, one question has persisted about the conduct of foreign policy: where does the Constitution lodge the power to determine the foreign relations of the United States? The seven essays in this book examine this problem and whether a solution can be found in a constitutional system of separation of powers. The foreign policy power is likely to be debated in every congressional session and in every administration, as scholars and practitioners seek the best combination of cooperation and coordination between the legislature and the executive.