The Trump administration’s Justice Department on Friday urged the U.S. Supreme Court to rule that a federal civil rights law does not bar discrimination against transgender employees, staking a position against the U.S. Equal Employment Opportunity Commission’s push for broader workplace protections.

The Justice Department’s brief in R.G. and G.R. Harris Funeral Homes v. EEOC was not signed by the EEOC’s general counsel, an indication the agency did not support the submission to the high court. Justice Department briefs filed on behalf of federal agencies in the Supreme Court typically bear the names of counsel for the agency.

“In 1964, the ordinary public meaning of ‘sex’ was biological sex,” U.S. Solicitor General Noel Francisco said in the new filing. “In the particular context of Title VII—legislation originally designed to eliminate employment discrimination against racial and other minorities—it was especially clear that the prohibition on discrimination because of ‘sex’ referred to unequal treatment of men and women in the workplace.”