446
Opinion of the Court
"The exercise of judicial power under Art. III of the Constitution depends on the existence of a case or controversy," and "a federal court [lacks] the power to render advisory opinions." Preiser v. Newkirk, 422 U. S. 395, 401 (1975); see also Flast v. Cohen, 392 U. S. 83, 97 (1968). The Bank maintains that there was no case or controversy about the validity of section 92, and that in resolving the status of the provision the Court of Appeals violated the Article III prohibition against advisory opinions.
There is no doubt, however, that from the start respondents' suit was the "pursuance of an honest and actual antagonistic assertion of rights by one [party] against another," Muskrat v. United States, 219 U. S. 346, 359 (1911) (internal quotation marks and citation omitted), that "valuable legal rights . . . [would] be directly affected to a specific and substantial degree" by a decision on whether the Comptroller's ruling was proper and lawful, Nashville, C. & St. L. R. Co. v. Wallace, 288 U. S. 249, 262 (1933), and that the Court of Appeals therefore had before it a real case and controversy extending to that issue. Though the parties did not lock horns over the status of section 92, they did clash over whether the Comptroller properly relied on section 92 as authority for his ruling, and "[w]hen an issue or claim is properly before the court, the court is not limited to the particular legal theories advanced by the parties, but rather retains the independent power to identify and apply the proper construction of governing law," Kamen v. Kemper Financial Services, Inc., 500 U. S. 90, 99 (1991), even where the proper construction is that a law does not govern because it is not in force. "The judicial Power" extends to cases "arising under . . . the Laws of the United States," Art. III, § 2, cl. 1, and a court properly asked to construe a law has the constitutional power to determine whether the law exists, cf. Cohens v. Virginia, 6 Wheat. 264, 405 (1821) ("[I]f, in any controversy depending in a court, the cause should depend on the validity of such a law, that would be a case arising under
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