Cite as: 504 U. S. 36 (1992)
Opinion of the Court
tioner did not contest the issue in the case immediately at hand, it did so as a party to the recent proceeding upon which the lower courts relied for their resolution of the issue, and did not concede in the current case the correctness of that precedent. Undoubtedly the United States benefits from this rule more often than other parties; but that is inevitably true of most desirable rules of procedure or jurisdiction that we announce, the United States being the most frequent litigant in our courts. Since we announce the rule to be applicable to all parties; since we have recently applied a similar rule (indeed, a rule even more broadly cast) to the disadvantage of the United States, see Stevens v. Department of Treasury, 500 U. S. 1 (1991); and since the dissenters themselves have approved the application of this rule (or a broader one) in circumstances rationally indistinguishable from those before us, see n. 2, supra; the dissent's suggestion that in deciding this case "the Court appears to favor the Government over the ordinary litigant," post, at 59, and compromises its "obligation to administer justice impartially," ibid., needs no response.
III
Respondent does not contend that the Fifth Amendment itself obliges the prosecutor to disclose substantial exculpa-tory evidence in his possession to the grand jury. Instead, building on our statement that the federal courts "may, within limits, formulate procedural rules not specifically required by the Constitution or the Congress," United States v. Hasting, 461 U. S. 499, 505 (1983), he argues that imposition of the Tenth Circuit's disclosure rule is supported by the courts' "supervisory power." We think not. Hasting, and the cases that rely upon the principle it expresses, deal strictly with the courts' power to control their own procedures. See, e. g., Jencks v. United States, 353 U. S. 657, 667-
diction whether a party raised below and argued a federal-law issue that the state supreme court actually considered and decided").
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