Andy McCarthy reminds us what it is, and why it matters:

Our Constitution vests Congress with the power to declare war. That authority cannot be delegated to an international tribunal that lacks political accountability to the American people. The decision to go to war is the most significant one a body politic can make. Thus the Framers designed our system to make certain that the responsible officials are answerable to the people whose lives are at stake and who are expected to foot the bills.

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