Washington, D.C.’s police union is suing the city over a recently passed police reform bill, alleging a block on the union’s ability to negotiate on discipline for law enforcement is unconstitutional.

The D.C. Council passed the emergency bill in June as protests over police killings of Black Americans were held across the country, including in D.C. The bill, which included a number of reforms, such as mandating the release of body camera footage after officer-involved shootings and blocking the city from hiring officers who were either fired for or resigned ahead of disciplinary measures, was signed into law by Mayor Muriel Bowser on July 22.