The U.S. Court of Appeals for the D.C. Circuit today decided not to step too deep in a challenge to the Senate’s filibuster rule.

The appeals court today struck down a suit in which the challengers, led by the advocacy group Common Cause, sued over the constitutionality of the Senate’s filibuster rule. The plaintiffs in May 2012 sued Vice President Joe Biden and three officers of the Senate. The appeals court did not rule on the merits of the case. Instead, a three-judge panel said it lacked jurisdiction to decide the case.