When the Senate returns after Labor Day, Senate Democrats plan to push legislation to force presidential candidates to disclose their tax returns.

They are making no secret that the impetus for their action is this year’s Republican presidential nominee Donald Trump.

Senate Finance ranking member Ron Wyden of Oregon who unveiled the proposal in May, told reporters Thursday that he would be taking the floor and calling for the measure to be passed when the legislative session resumes.

“The reality is for 40 years, there has been a good government, transparency-in-politics standard,” Wyden said. “The bottom line is you just don’t get to hide your tax return from public view when you’re running for president of the United States.”

[Clinton Ad Hits Trump on Tax Returns]