“suppressed” Brady materials. To the extent the prosecution is imputed with knowledge about the underlying information, it is too vague and attenuated to Butler’s investigation to be material. Accordingly, we conclude that there is no need to remand the Brady, analysis to the district court and we AFFIRM the district court’s denial of relief on this, basis. Cir.2001) (“[Ineffective assistance of habeas counsel cannot provide cause for a procedural default.”)). After the district court’s decision, the Supreme Court held that defendants convicted in Texas may attempt to demonstrate that the ineffectiveness of state ha-beas counsel is cause for failure to raise an IATC claim during state habeas proceedings. See Martinez v. Ryan, — U.S. -, 132 S.Ct. 1309, 1318-19, 182 L.Ed.2d 272 (2012) (<HOLDING>); Trevino, 133 S.Ct. at 1915, 1921 (holding
holding that a federal court may excuse a state habeas petitioners procedural default if the petitioner can show cause for the failure to raise the claim and prejudice resulting from such failure holding federal habeas proceeding was properly dismissed for failure to exhaust state remedies when petitioners direct appeal from resentencing was still pending in state court at the time he sought habeas relief holding that the federal role in reviewing an application for habeas corpus is limited to evaluating what occurred in the state or federal proceedings that actually led to the petitioners conviction what occurred in the petitioners collateral proceeding does not enter into the habeas proceeding holding that habeas petitioner scheduled to be executed in the state of virginia for capital murder could not raise claim of violation of his rights under the vienna convention on federal habeas review where he failed to preserve the claim by raising it in state court proceedings vienna convention does not trump subsequent federal statute requiring habeas petitioners who claim to be held in violation of treaties of the united states to develop factual bases for their claims in state court as a precondition of federal habeas review holding habeas petitioners may show cause for such default in specific circumstances in states that require petitioners to raise iatc claims in initial state habeas proceedings rather than on direct appeal