Whether a petitioner demonstrates a substantial showing of the denial of a constitutional right warranting a certificate of appealability

QUESTION PRESENTED I. Whether a Petitioner demonstrates that he has made “a substantial , showing of the denial of a constitutional right” warranting the , issuance of a certificate of appealability under 28 U.S.C. § 2255 and § 2253(c), where the trial court failed to vacate the mandatory life sentence imposed pursuant to 21 U.S.C. § 851, despite the court’s determination that Petitioner, pursuant to Johnson v. United States, 544 U.S. 295 (2005), diligently obtained the vacatur of the state court conviction used as a predicate to impose the mandatory life sentence.