Whether the Sixth Circuit committed plain error in considering the merits of Campbell's appeal without issuing a certificate of appealability first

QUESTIONS PRESENTED FOR REVIEW I. The Sixth Circuit coasitted plain error, contrary to Buck v. Davis, 137 S.Ct. 759 (2017) and Miller-El v. Cockrell, 537 U.S. 322 (2003), because it did not. have jurisdiction to consider the merit of Caap~ bell's appeal froa the district court's ruling on his habeas petition without issuing a certificate of appealability first. : II. Whether reasonable jurist could debate the District.Court's procedural holding .that. Campbell had not. met..the burden .to trigger a later start ; date of the statute of limitation under. 28 U.S.C. § 2244(d)(1)(D)? di ;