Whether federal courts have jurisdiction under 28 U.S.C. § 2241 over a petition for habeas corpus alleging that a prisoner's unconstitutional conditions of incarceration require release

QUESTION PRESENTED Whether federal courts have jurisdiction under 28 U.S.C. § 2241 over a petition for habeas corpus alleging that a prisoner’s unconstitutional conditions of incarceration require release, either because habeas jurisdiction generally extends to claims, or because it at least extends to such claims when the prisoner seeks his release from custody?