A Washington federal trial judge was urged Tuesday to force the U.S. Treasury Department to disclose to House committee members several years of President Donald Trump’s tax returns, an escalation of a dispute that comes after the administration refused to comply with a congressional subpoena.

“In refusing to comply with the statute, defendants have mounted an extraordinary attack on the authority of Congress to obtain information needed to conduct oversight of Treasury, the IRS, and the tax laws on behalf of the American people who participate in the nation’s voluntary tax system,” lawyers for the House Ways and Means Committee said in the complaint, filed in the U.S. District Court for the District of Columbia.