President Donald Trump, backed by Michael Best & Friedrich and Consovoy McCarthy Park, is going on the offensive to block a U.S. House Oversight Committee subpoena targeting the president’s accountant.

The complaint, filed in U.S. District Court for the District of Columbia on Monday, looks to head off a subpoena filed by U.S. Rep. Elijah Cummings, the chairman of the House Oversight Committee, which seeks financial statements, documents and communications from the president’s longtime accounting firm, Mazars USA LLP.