A total of 36 former U.S. Justice Department civil rights lawyers are urging a federal appellate court to strike down Florida’s law conditioning the right to vote for people with felony convictions on the payment of restitution, fines and fees.

The lawyers, many of whom held high-ranking positions in the civil rights division and the voting section from the Eisenhower to Obama administrations, argued in an amicus brief the state law is an unlawful tax based on the U.S. Supreme Court’s 2012 decision upholding Obamacare.