OCTOBER TERM, 1961. Opinion of the Court. 369 U. S. action is stated upon which appellants would be entitled to appropriate relief; and (c) because appellees raise the issue before this Court, that the appellants have standing to challenge the Tennessee apportionment statutes.'" Beyond noting that we have no cause at this stage to doubt the District Court will be able to fashion relief if violations of constitutional rights are found, it is improper now to consider what remedy would be most appropriate if appellants prevail at the trial. II. JURISDICTION OF THE SUBJECT MATTER. The District Court was uncertain whether our cases withholding federal judicial relief rested upon a lack of federal jurisdiction or upon the inappropriateness of the subject matter for judicial consideration-what we have designated "non justiciability." The distinction between the two grounds is significant. In the instance of nonjusticiability, consideration of the cause is not wholly and immediately foreclosed; rather, the Court's inquiry necessarily proceeds to the point of deciding whether the duty asserted can be judicially identified and its breach judicially determined, and whether protection for the right asserted can be judicially molded. In the instance of lack of jurisdiction the cause either does not "arise under" the Federal Constitution, laws or treaties (or fall within one of the other enumerated categories of Art. III, § 2), or is not a "case or controversy" within the meaning of that section; or the cause is not one described by any jurisdictional statute. Our conclusion, see pp. 208-237. infra, that this cause presents no nonjusticiable "political question" settles the only possible doubt that it is a case or controversy. Under the present heading of "Jurisdic16 We need not reach the question of indispensable parties because the District Court has not yet decided it.

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