Whether a petitioner seeking the issuance of a certificate of appealability under 28 U.S.C. § 2253 is required to demonstrate that jurists of reason would find the merits of his claims debatable, or, instead, to demonstrate only that jurists of reason would find the basis for denying relief itself debatable?

QUESTION PRESENTED Whether a petitioner seeking the issuance of a certificate of appealability under 28 U.S.C. § 2253 is required to demonstrate that jurists of reason would find the merits of his claims debatable, or, instead, to demonstrate only that jurists of reason would find the basis for denying relief itself debatable? , i