President Trump joked about potentially releasing his tax returns on Wednesday during a meeting with members of the Senate's tax-writing committee, according to a Democratic lawmaker attending the meeting.

"He joked about, someday maybe you'll see my tax returns," Sen. Sherrod Brown Sherrod Campbell BrownBipartisan praise pours in after Ginsburg's death Emboldened Democrats haggle over 2021 agenda Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election MORE (D-Ohio) told reporters.

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Trump is the first president in decades who hasn't made at least some of his tax returns public. He cited an ongoing Internal Revenue Service audit as his reasoning, but the tax agency has said that an audit doesn't prevent people from releasing their own tax information.

Democrats, along with a few Republicans, have called for Trump to release his returns. Democratic lawmakers have unsuccessfully pushed to get the chairmen of the tax-writing committees to request the president's returns from the Treasury Department, and they have also offered legislation that would require presidents and presidential nominees to disclose their returns.

One reason Democrats have wanted to see Trump's returns is to learn how the president might benefit from any tax-reform proposal. Trump was meeting on Wednesday with Republicans and Democrats on the Senate Finance Committee to push his tax plan.

Brown said that after Trump made a comment about his returns, Republicans in the room laughed.

"It's just a joke to them. Isn't this funny that the president has never done this, while every president has, including some of the early heroes like Reagan and Ford and Nixon," Brown said.