WASHINGTON (AP) — The Republican drive to overhaul financial regulations Wednesday turned into a contentious debate over Democratic efforts to cast a spotlight on President Donald Trump’s business empire and his refusal to release his tax returns.

House Republicans are working to undo much of the 2010 Dodd-Frank law that put the stiffest restrictions on banks and Wall Street since the 1930s Depression. Democrats don’t have the numbers to stop their efforts in the House, but they are intent on making them pay a price if any conflicts of interest emerge for Trump down the road.

A House panel spent much of the day Wednesday debating an amendment that would bar the GOP replacement for the law from going into effect until the Office of Government Ethics certifies the changes in the bill would not directly benefit Trump or any of his appointees with influence over federal regulations.

“As members of Congress develop a public policy, you have a responsibility to ensure this president is not benefiting,” said Rep. Maxine Waters, the top Democrat on the House Financial Services Committee. “Why hasn’t he shown his tax returns? That would help us understand whether or not he’s benefiting from any of our work.”

Republicans called the amendment partisan. “One thing after the next, I see my colleagues on the other side do everything in their power to undermine this president and it’s wrong,” said Rep. Lee Zeldin, R-N.Y.

Presidents are not subject to the conflict-of-interest laws that their own appointees must follow, but until now they have followed them anyway to set an example. Trump is blazing a different trail by refusing to give up a financial interest in his company while turning over the reins to his adult sons and a senior executive.

Some ethics experts have called for Trump to sell off his assets and place his investments in a blind trust, an entity his family would not control. That’s what previous presidents have done.

On the second day of its contentious, marathon session, the GOP-led Financial Services Committee also rebuffed Democratic attempts to protect the Consumer Financial Protection Bureau, the five-year-old agency that enforces consumer protection laws and scrutinizes the practices of virtually any business selling financial products and services. That ranges from credit card companies to mortgage servicers to auto lenders.

Democrats said that when they created Dodd-Frank, they wanted to make the consumer agency as independent from political influence as possible.

Republicans complained Congress has too little say over how the bureau operates.

Democrats also tried to preserve a new federal rule targeting consumers’ retirement investments and the advice they receive from financial professionals. The Republican overhaul bill would repeal a Labor Department rule requiring brokers who recommend investments for retirement savers to meet the stricter standard that applies to registered advisers: They must act as “fiduciaries” — trustees who are obliged to put their clients’ best interests above all.

Republicans on the panel said the rule, which hasn’t taken effect, would strip individual investors of choices.

Another Democratic attempt would block a provision in the Republican bill that would tighten congressional oversight of the Federal Reserve and crimp its emergency lending authority.