Whether, under this Court's holdings, in Miller-El v. Cockrell , 537
U.S. 322 (2008), and Buck v. Davis, 580 U.S. 100 (2017), it is inadequate
for a Court of Appeals to merely deny an application for Certificate of
Appealability, without stating whether the denial is procedural, or on
the merits, thereby preventing meaningful review. Especially when the
applicant made a substantial showing of the denial of a Constitutional
right, by showing as to each issue that reasonable jurists would find
the District Court's ruling debatable or wrong.

whether-certificate-of-appealability-denial-requires-explanation