Cite as: 504 U. S. 555 (1992)
Opinion of the Court
ing § 7(a)(2) to require consultation only for actions taken in the United States or on the high seas, was proposed in 1983, 48 Fed. Reg. 29990, and promulgated in 1986, 51 Fed. Reg. 19926; 50 CFR 402.01 (1991).
Shortly thereafter, respondents, organizations dedicated to wildlife conservation and other environmental causes, filed this action against the Secretary of the Interior, seeking a declaratory judgment that the new regulation is in error as to the geographic scope of § 7(a)(2) and an injunction requiring the Secretary to promulgate a new regulation restoring the initial interpretation. The District Court granted the Secretary's motion to dismiss for lack of standing. Defenders of Wildlife v. Hodel, 658 F. Supp. 43, 47-48 (Minn. 1987). The Court of Appeals for the Eighth Circuit reversed by a divided vote. Defenders of Wildlife v. Hodel, 851 F. 2d 1035 (1988). On remand, the Secretary moved for summary judgment on the standing issue, and respondents moved for summary judgment on the merits. The District Court denied the Secretary's motion, on the ground that the Eighth Circuit had already determined the standing question in this case; it granted respondents' merits motion, and ordered the Secretary to publish a revised regulation. Defenders of Wild-life v. Hodel, 707 F. Supp. 1082 (Minn. 1989). The Eighth Circuit affirmed. 911 F. 2d 117 (1990). We granted certiorari, 500 U. S. 915 (1991).
II
While the Constitution of the United States divides all power conferred upon the Federal Government into "legislative Powers," Art. I, § 1, "[t]he executive Power," Art. II, § 1, and "[t]he judicial Power," Art. III, § 1, it does not attempt to define those terms. To be sure, it limits the jurisdiction of federal courts to "Cases" and "Controversies," but an executive inquiry can bear the name "case" (the Hoffa case) and a legislative dispute can bear the name "controversy" (the Smoot-Hawley controversy). Obviously, then, the Constitution's central mechanism of separation of powers de-
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