The U.S. Department of Justice filed documents Wednesday in an ongoing legal battle for President Donald Trump’s tax returns, which were subpoenaed by New York County District Attorney Cyrus Vance Jr. in August.

U.S. Department of Justice special counsel Joshua Garner argued that it is “correct and important” for Trump’s subpoena challenge to move forward in federal court and not state court. Vance’s lawyers have repeatedly said a state subpoena should be challenged in state court.