Rep. Walter Jones (R-N.C.) signed on this week to a Democratic procedural effort to force a vote on legislation that would require President Trump to make his tax returns public, making him the first Republican to back the effort.

Trump broke with long-standing precedent during the 2016 presidential race by refusing to release his tax returns. Trump claimed that he can't publish his returns because they're under audit, but the IRS has said an audit doesn't prevent personal tax information from being made public.

In response, Democrats launched a procedure known as a discharge petition last month on Rep. Anna Eshoo’s (D-Calif.) bill requiring presidents and presidential candidates to provide their last three years of federal income tax returns to the Office of Government Ethics or the Federal Election Commission.

Those agencies would then make the tax returns available to the public. If a president or candidate refuses to disclose their tax returns, the agencies would have to ask for the returns from the IRS.

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Three other Republicans have co-sponsored the underlying legislation: Reps. Mark Sanford (S.C.), Justin Amash Justin AmashOn The Trail: How Nancy Pelosi could improbably become president History is on Edward Snowden's side: Now it's time to give him a full pardon Trump says he's considering Snowden pardon MORE (Mich.) and Ted Yoho Theodore (Ted) Scott YohoKat Cammack wins Florida GOP primary in bid for Ted Yoho's seat The Hill's Convention Report: Democrats gear up for Day Two of convention Eyes turn to Ocasio-Cortez as she seeks to boost Biden MORE (Fla.). None have signed onto the discharge petition, however, and Republicans typically don’t endorse Democratic procedural efforts.

Democrats have been forcing near-weekly votes since late February on resolutions to direct the House Ways and Means Committee to ask the IRS for Trump’s tax returns, most recently on Wednesday.

Jones has voted with Democrats on all of those resolutions, but Sanford has voted “present” because he disagrees with the procedural method despite believing Trump should release his tax returns.

Discharge petitions must get 218 signatures to trigger a vote on the House floor. It’s a tool frequently used by the minority party to draw attention to an issue but is rarely effective.

The discharge petition for Eshoo's bill currently has 191 signatures, meaning it needs at least 27 more endorsements to move forward. It's unlikely enough Republicans would sign onto the effort.

The last time a discharge petition resulted in a floor vote was in 2015, when enough Republicans joined with Democrats to bring up legislation to reauthorize the Export-Import Bank despite objections from the committee chairman of jurisdiction, Rep. Jeb Hensarling (R-Texas) of the Financial Services panel.

Before that, a discharge petition had last been successful in 2002 to bring up campaign finance reform legislation.

Jones, who’s served in the House since 1995, frequently bucks GOP leaders on a range of issues. He also signed a Democratic discharge petition on Wednesday to push for a vote on legislation to establish an independent, bipartisan commission to investigate Russia’s attempts to influence the 2016 presidential election.