Democrats, especially in the House, are quietly planning on using an obscure law that will enable them to examine the president’s tax filings without his permission.

The nearly 100-year-old statute allows the chairmen of Congress’ tax committees to look at anyone’s returns, and Democrats say they intend to use that power to help answer a long list of questions about Trump’s finances. Many also want to use it to make public confidential information about Trump’s taxes that he’s steadfastly refused to release.

“Probably the approach would be to get all of it, review it and, depending on what that shows, release all or part of it,” said Rep. Lloyd Doggett, the No. 4 Democrat on the Ways and Means Committee.