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6 Rh disagreed with the position of the United States and with the court below: the House and Senate, which had intervened in the case. Because Chadha concerned the validity of a mode of congressional action—the one-house legislative veto—the House and Senate were threatened with destruction of what they claimed to be one of their institutional powers. The Executive choosing not to defend that power, we permitted the House and Senate to intervene. Nothing like that is present here.

To be sure, the Court in Chadha said that statutory aggrieved-party status was "not altered by the fact that the Executive may agree with the holding that the statute in question is unconstitutional." Id., at 930–931. But in a footnote to that statement, the Court acknowledged Article III's separate requirement of a "justiciable case or controversy," and stated that this requirement was satisfied "because of the presence of the two Houses of Congress as adverse parties." Id., at 931, n. 6. Later in its opinion, the Chadha Court remarked that the United States' announced intention to enforce the statute also sufficed to permit judicial review, even absent congressional participation. Id., at 939. That remark is true, as a description of the judicial review conducted in the Court of Appeals, where the Houses of Congress had not