Whether cause exists to excuse a habeas petitioner's procedural default

QUESTION PRESENTED FOR REVIEW 1. | Whether cause exists to excuse a habeas petitioner’s procedural default when near-unanimous circuit precedent foreclosed the petitioner’s claim or when this Court explicitly overrules one of its precedents. 2. Whether the offense of aiding and abetting another who attempted to murder a witness is a “crime of violence” under 18 U.S.C. § 924(c)’s force clause. i