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10 Rh nor to defend the statute he believed to be unconstitutional, see Presidential Authority to Decline to Execute Unconstitutional Statutes, 18 Op. Off. Legal Counsel 199 (Nov. 2, 1994)—in which event Windsor would not have been injured, the District Court could not have refereed this friendly scrimmage, and the Executive's determination of unconstitutionality would have escaped this Court's desire to blurt out its view of the law. The matter would have been left, as so many matters ought to be left, to a tug of war between the President and the Congress, which has innumerable means (up to and including impeachment) of compelling the President to enforce the laws it has written. Or the President could have evaded presentation of the constitutional issue to this Court simply by declining to appeal the District Court and Court of Appeals dispositions he agreed with. Be sure of this much: If a President wants to insulate his judgment of unconstitutionality from our review, he can. What the views urged in this dissent produce is not insulation from judicial review but insulation from Executive contrivance.

The majority brandishes the famous sentence from Marbury v. Madison, 1 Cranch 137, 177 (1803) that "[i]t is emphatically the province and duty of the judicial department to say what the law is." Ante, at 12 (internal quotation marks omitted). But that sentence neither says nor implies that it is always the province and duty of the Court to say what the law is—much less that its responsibility in that regard is a "primary" one. The very next sentence of Chief Justice Marshall's opinion makes the crucial qualification that today's majority ignores: "Those who apply the rule to particular cases, must of necessity expound and interpret that rule." 1 Cranch, at 177 (emphasis added). Only when a "particular case" is before us—that is, a controversy that it is our business to resolve under Article III—do we have the province and duty to pronounce the law. For the views of our early Court more