484
Opinion of the Court
must make a substantial showing of the denial of a constitutional right, a demonstration that, under Barefoot, includes showing that reasonable jurists could debate whether (or, for that matter, agree that) the petition should have been resolved in a different manner or that the issues presented were " 'adequate to deserve encouragement to proceed further.' " Barefoot, supra, at 893, and n. 4 ("sum[ming] up" the " 'substantial showing' " standard).
Where a district court has rejected the constitutional claims on the merits, the showing required to satisfy § 2253(c) is straightforward: The petitioner must demonstrate that reasonable jurists would find the district court's assessment of the constitutional claims debatable or wrong. The issue becomes somewhat more complicated where, as here, the district court dismisses the petition based on procedural grounds. We hold as follows: When the district court denies a habeas petition on procedural grounds without reaching the prisoner's underlying constitutional claim, a COA should issue when the prisoner shows, at least, that jurists of reason would find it debatable whether the petition states a valid claim of the denial of a constitutional right and that jurists of reason would find it debatable whether the district court was correct in its procedural ruling. This construction gives meaning to Congress' requirement that a prisoner demonstrate substantial underlying constitutional claims and is in conformity with the meaning of the "substantial showing" standard provided in Barefoot, supra, at 893, and n. 4, and adopted by Congress in AEDPA. Where a plain procedural bar is present and the district court is correct to invoke it to dispose of the case, a reasonable jurist could not conclude either that the district court erred in dismissing the petition or that the petitioner should be allowed to proceed further. In such a circumstance, no appeal would be warranted.
Determining whether a COA should issue where the petition was dismissed on procedural grounds has two compo-
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