BUCKLEY v. VALEO Per Curiam 1 by several months than it was at the time the Court of Appeals ruled. Congress was understandably most concerned with obtaining a final adjudication of as many issues as possible litigated pursuant to the provisions of § 437h. Thus, in order to decide the basic question whether the Act's provision for appointment of the members of the Commission violates the Constitution, we believe we are warranted in considering all of those aspects of the Commission's authority which have been presented by the certified questions." 8 Party litigants with sufficient concrete interests at stake may have standing to raise constitutional questions of separation of powers with respect to an agency designated to adjudicate their rights. Palmore v. United States, 411 U. S. 389 (1973); Glidden Co. v. Zdanok, 370 U. S. 530 (1962); Coleman v. Miller, 307 U. S. 433 (1939). In Glidden, of course, the challenged adjudication had already taken place, whereas in this case appellants' claim is of impending future rulings and determinations by the Commission. But this is a question of ripeness, rather than lack of case or controversy under Art. III, and for the reasons to which we have previously 158 With respect to the Commission's power under 26 U. S. C. § 9008 (d) (3) (1970 ed., Supp. IV) to authorize excessive convention expenditures (question 8 (f)), the fact that appellants in the Court of Appeals may have focused their attack primarily or even exclusively upon the asserted lack of standards attendant to that power, see n. 157, supra, does not foreclose them from challenging that power in relation to Congress' method of appointment of the Commission's members. Question 8 (f) asks whether vesting the Commission with this power under 26 U. S. C. § 9008 (1970 ed., Supp. IV) violates "such rights," which by reference to question 8 includes "the rights of [appellants] under the constitutional separation of powers." Since the certified questions themselves provide our jurisdictional framework, § 437h (b), the separation-of-powers aspect of appellants' attack on 26 U. S. C. § 9008 (d) (3) (1970 ed., Supp. IV) is properly before this Court.