Cite as: 505 U. S. 277 (1992)
Opinion of Thomas, J.
In subsequent cases, we repeatedly reaffirmed Brown's teaching that mixed constitutional questions are "open to review on collateral attack," Cuyler v. Sullivan, 446 U. S. 335, 342 (1980), without ever explicitly considering whether that "review" should be de novo or deferential. In some of these cases, we would have denied habeas relief even under de novo review, see, e. g., Strickland v. Washington, 466 U. S. 668, 698 (1984) (facts make it "clear" that habeas petitioner did not receive ineffective assistance of counsel); Neil v. Biggers, 409 U. S. 188, 201 (1972) (facts disclose "no substantial likelihood" that habeas petitioner was subjected to unreliable pretrial lineup); in others, we would have awarded habeas relief even under deferential review, see, e. g., Brewer v. Williams, 430 U. S. 387, 405 (1977) (facts provide "no reasonable basis" for finding valid waiver of right to counsel); Irvin v. Dowd, 366 U. S. 717, 725 (1961) (facts show "clear and convincing" evidence of biased jury); and in yet others, we remanded for application of a proper legal rule without addressing that standard of review question, see, e. g., Cuyler, supra, at 342, 350. Nonetheless, because these cases never qualified our early citation of Brown for the proposition that a federal habeas court must reexamine mixed constitutional questions "independently," Townsend v. Sain, 372 U. S. 293, 318 (1963) (dictum), we have gradually come to treat as settled the rule that mixed constitutional questions are "subject to plenary federal review" on habeas, Miller v. Fenton, 474 U. S. 104, 112 (1985).6
we conclude not that Brown v. Allen establishes deferential review for reasonableness, but only that Brown does not squarely foreclose it.
6 We have no disagreement with Justice O'Connor that Brown v. Allen quickly came to be cited for the proposition that a habeas court should review mixed questions "independently"; that several of our cases since Brown have applied a de novo standard with respect to pure and mixed legal questions; and that the de novo standard thus appeared well settled with respect to both categories by the time the Court decided Miller v. Fenton in 1985. See post, at 301-302. Despite her extended discussion of the leading cases from Brown through Miller, however, Justice OíCon-
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