Whether a district court must review evidence in the state-court record when the habeas petitioner alleges it demonstrates that the state court unreasonably determined there was sufficient evidence supporting a conviction, and whether a federal court errs if it denies a habeas petitioner a certificate of appealability by explaining how the habeas claim lacks merit instead of explaining why reasonable jurists could not debate the petitioner's claim

1. Whether a district court must review evidence in the state -court record when the habeas petitioner alleges it demonstrates that the state court unreasonably determined there was sufficient evidence supporting a conviction. 2. Whether a federal court errs if it denies a habeas petitioner a certificate of appealability by explaining how the habeas claim lacks merit instead of explaining why reasonable jurists could not debate the petitioner’s claim.