Whether a criminal defendant pursuing a second or successive motion under 28 U.S.C. § 2255 is entitled to relief under a retroactive constitutional decision invalidating a federal statutory provision, where the record is silent as to whether the district court based its original judgment on that provision or another provision of the same statute

QUESTION PRESENTED Whether, or under what circumstances, a criminal defendant pursuing a second or successive motion under 28 U.S.C. § 2255 is entitled to relief under a retroactive constitutional decision invalidating a federal statutory provision, where the record is silent as to whether the district court based its original judgment on that provision or another provision of the same statute.