(CNN)The Supreme Court on Monday rejected a long shot bid from registered voters in the District of Columbia who sought the ability to elect representatives to Congress.

       The group of voters said their inability to vote for members of Congress violated their rights to equal protection and due process and pointed to the fact that Congress extended voting rights to overseas residents but not to similarly situated residents of DC.

       "Residents of the District of Columbia are the only adult American citizens subject to federal income taxes who lack voting representation in Congress, except for felons in some States," lawyers for the residents wrote in legal papers.

       A lower court ruled against the voters, holding that they do not live in a "state."

       Supreme Court's new term could see landmark rulings on abortion, guns and vouchers

       The court rejected the appeal without comment.

       Read More

       The court's action comes amid an ongoing debate on whether to make the federal district the country's 51st state. Democrats and advocates for DC statehood say making the district a state would allow for equal representation in Congress while Republicans argue it is a progressive effort to push their agenda by adding votes in the House and Senate.

       The District of Columbia had over 689,000 residents in 2020, according to recent US Census results. The district has no voting member of Congress and Senate representation, but is is represented in the House by Del. Eleanor Holmes Norton, a Democrat. Legislation introduced by Norton that would grant statehood to DC passed the House in April.