The Washington Post editorial board is calling on President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE to release his tax returns to show how much he would benefit from the new GOP tax plan.

In an editorial published Thursday, just hours before Trump signed the bill into law during a surprise Friday ceremony, the board called for him to release the returns to show the impact the bill would have on him and his income.

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“Exactly how the president would benefit personally from legislation he pushed — and soon plans to sign into law — is something the American public has a right to know,” the board wrote.

“That it continues to remain in the dark is due, of course, to Mr. Trump’s refusal to release his tax returns and Congress’s complicity in failing to insist on a minimal degree of openness from the executive.”

Trump has repeatedly claimed that he would be hurt by the new legislation.

But the newspaper's editorial board pointed out that the bill would lower taxes for the top earners in the country, and that Trump would likely fall into that bracket — but it was unclear how much he would benefit from the tax cuts because his returns are not public.

“In fact, as experts have pointed out, Mr. Trump and his family are likely to reap immense rewards from a lower top tax rate, a lucrative new deduction for the 'pass-through' businesses he controls and changes to the estate tax,” the board wrote.

“So much for the populist spin about middle-class Americans.”

The board noted that White House press secretary Sarah Huckabee Sanders has said Trump’s businesses could benefit from the bill.

Critics have repeatedly called for Trump to release his tax returns since his campaign. He broke with four decades of precedent by refusing to make the documents public, citing a current IRS audit. The IRS publicly said that those under audit can still release their returns.

Democrats had pushed for a measure forcing Trump to release his returns as part of the tax legislation, but House Republicans quickly shot it down.