Ronald Reagan's term in office was punctuated by four significant employments of military force: the deployment of Marines to Lebanon; the intervention in Grenada; the air strikes against Libya; and the deployment of naval forces to the Persian Gulf. In the aftermath of each of these military operations, critics questioned the constitutional basis for such unilateral presidential war-making, arguing that Congress alone is empowered to declare war. Debates over whether the President failed to comply with the statutory requirements of the War Powers Resolution further complicated these...