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4 Rh the ground that it "involved an unusual statute that vested the House and the Senate themselves each with special procedural rights—namely, the right effectively to veto Executive action." Brief for United States (jurisdiction) 36. But that is a distinction without a difference: just as the Court of Appeals decision that the Chadha Court affirmed impaired Congress' power by striking down the one-house veto, so the Second Circuit's decision here impairs Congress' legislative power by striking down an Act of Congress. The United States has not explained why the fact that the impairment at issue in Chadha was "special" or "procedural" has any relevance to whether Congress suffered an injury. Indeed, because legislating is Congress' central function, any impairment of that function is a more grievous injury than the impairment of a procedural add-on.

The Court's decision in Coleman v. Miller, 307 U.S. 433 (1939), bolsters this conclusion. In Coleman, we held that a group of state senators had standing to challenge a lower court decision approving the procedures used to ratify an amendment to the Federal Constitution. We reasoned that the senators' votes—which would otherwise have carried the day—were nullified by that action. See id., at 438 ("Here, the plaintiffs include twenty senators, whose votes against ratification have been overridden and virtually held for naught although if they are right in their contentions their votes would have been sufficient to defeat ratification. We think that these senators have a plain, direct and adequate interest in maintaining the effectiveness of their votes"); id., at 446 ("[W]e find no departure from principle in recognizing in the instant case that at least the twenty senators whose votes, if their contention were sustained, would have been sufficient to defeat the resolution ratifying the proposed constitutional amendment, have an interest in the controversy which, treated by the state court as a basis for entertaining and