The lawsuit was filed in the District Court for the District of Columbia, on January 2, 1975, by U.S. Senator James L. Buckley (a member of the Conservative Party of New York State), former U.S. Senator and 1968 presidential candidate Eugene McCarthy (a Democrat from Minnesota), the New York Civil Liberties Union, the American Conservative Union, the Peace & Freedom Party, the Libertarian Party, and numerous other plaintiffs. The named defendant in the caption was Francis R. Valeo, the Secretary of the Senate, an "ex officio" member of the FEC who represented the U.S. federal government. The trial court denied plaintiffs' request for declaratory and injunctive relief. Plaintiffs then appealed to the Court of Appeals and finally to the Supreme Court.