Whether 28 U.S.C. § 2284(a) requires a district judge to request the convening of a three-judge district court whenever an action is filed challenging the constitutionality of congressional district apportionment

Whether 28 U.S.C. § 2284(a) requires a district judge to request the convening of a three-judge district court whenever an action is filed “challenging the constitutionality of the apportionment of congressional districts,” unless the claim is “wholly insubstantial” as recognized by this Court in Shapiro v. McManus , 577 U.S. 39 (2015).