1. Whether reasonable jurists could debate whether controlling circuit precedent precludes issuance of a certificate of appealability in a 28 U.S.C. § 2255 proceeding.

2. Whether a movant's procedural default may be excused because his constitutional vagueness challenge was "not reasonably available" prior to Johnson v. United States, 576 U.S. 591 (2015).

3. Whether a general verdict that was obtained in reliance on the unconstitutionally vague residual clause in 18 U.S.C. § 924(c)(8)(B) may be sustained based on the reviewing court's finding that the jury also relied on a valid basis to convict.

Whether reasonable jurists could debate whether controlling circuit precedent precludes issuance of a certificate of appealability