Where the Petitioner-Appellant's case presented a substantial showing of a denial of a constitutional right, and where the issues presented were debatable amongst jurists of reason, does the Sixth Circuit err by denying Petitioner-Appellant's request for a certificate of appealability?

Where the decision of the state court resulted in a decision that was contrary to, or involved an unreasonable application of, clearly established federal law, as determined by the Supreme Court of the United States, does the district court err by denying Petitioner-Appellant's petition for writ of habeas corpus?

Whether the Sixth Circuit erred in denying a certificate of appealability when the case presented a substantial showing of a denial of a constitutional right