Covington & Burling reported receiving more than $8 million in legal fees since October for legal services and other advocacy for the Moroccan state-owned phosphate rock miner OCP S.A., a longtime client, according to new filings submitted to the U.S. Justice Department.

Covington’s routine supplemental disclosure came as part of the law firm’s advocacy for OCP under the Foreign Agents Registration Act, which requires law firms, public relations consultants and lobbyists to register certain work for foreign government clients.