The making of sound U.S. foreign policy depends on a vigorous, deliberative, and often combative process that involves both the executive and the legislative branches. The country's Founding Fathers gave each branch both exclusive and overlapping powers in the realm of foreign policy, according to each one's comparative advantage -- inviting them, as the constitutional scholar Edwin Corwin has put it, "to struggle for the privilege of directing American foreign policy."
One of Congress' key roles is oversight: making sure that the laws it writes are faithfully executed and vetting the military and diplomatic activities of the executive. Congressional oversight is meant to keep mistakes from happening or from spiraling out of control; it helps draw out lessons from catastrophes in order to prevent them, or others like them, from recurring. Good oversight cuts waste, punishes fraud or scandal, and keeps policymakers on their toes. The task is not easy. Examining a department or agency, its personnel, and its implementation policies is time-consuming. Investigating possible scandals can easily lapse into a partisan exercise that ignores broad policy issues for the sake of cheap publicity.
The two of us began our immersion in Congress 37 years ago, participating in events such as the Senate Foreign Relations Committee's extended hearings on the Vietnam War. Throughout most of our time in Washington, tough oversight of the executive was common, whether or not different parties controlled the White House and Congress. It could be a messy and contentious process, and it often
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