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This Article examines the scope of the treaty power under the U.S. Constitution. A recent challenge in the courts has revived a debate over the reach and limits of the federal government’s treaty power that dates to the Founding. This Article begins by placing today’s debate into historical perspective—examining the understanding of the treaty power from the time of the Founding, through the Supreme Court’s landmark decision in 1920 in Missouri v. Holland , and up to the present. It then provides a systematic accoun of the actual and potential court-enforced limits on the treaty power—including affirmative constitutional limits, limits on implementing legislation, and limits on the scope of the Article II treaty power itself. In the process, the Article develops a detailed pretext test that courts could use to assess whether the federal government has exceeded its Article II authority. Yet even this elaborated pretext test is unlikely to be used to invalidate many treaties. Hence the most important protection against abuse of the treaty power comes not from the courts but from structural, political, and diplomatic checks on the exercise of the power itself—checks that this Article describes and assesses. These checks provide for “top-down” and “bottom-up” federalism accommodation. The result is a flexible system in which the states and the federal government work together to preserve the boundary between their respective areas of sovereignty. The Article concludes that this flexible system of accommodation is likely to be more effective than any court-enforced restraint at protecting against abuse of the federal treaty power.
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