A Baker & Hostetler lawyer is resisting a push by the American Civil Liberties Union to get access to documents related to his work with Ohio legislators during the 2011 redistricting cycle.

The ACLU hit E. Mark Braden, of counsel at the firm, with two subpoenas this summer. They came as part of the Ohio A. Philip Randolph Institute’s lawsuit—filed in May and currently before a three-judge panel in the U.S. District Court for the Southern District of Ohio in Cincinnati—challenging the state’s 2011 congressional map. The lawsuit argues that the map, drawn by Republicans who held the majority in the General Assembly, is an unconstitutional partisan gerrymander designed to favor the GOP.