Did the United States Court of Appeals, 6th Circuit, use an improper and unduly burdensome Certificate of Appealability (COA) standard which conflicts with this Court's precedent?

QUESTION(S) PRESENTED 14. Did the United States Court of Appeals, 6th Circuit, use an improper and unduly burdensome Certificate of Appealability (COA) standard which conflicts with this Court's precedent? 2. Did the United States Court of Appeals, 6th Circuit, wrongfully justify its denial of a COA on the six issues presented based on an adjudication on the merits, instead of limiting its review to a threshold inquiry into whether the underlying merits presented debatable issues or was wrongfully decided.