US Democratic lawmakers have given President Donald Trump 10 days to hand over his tax returns, which he refused to release ahead of the 2016 presidential election.

The lawmakers Saturday gave tax authorities a final deadline of April 23 to get their hands on the president’s tax returns.

The new deadline was announced after an initial April 10 deadline lapsed.

The announcement was made as part of an investigation launched in the Democratic-held House of Representatives.

“I am aware that concerns have been raised regarding my request and the authority of the Committee,” House Ways and Means Committee Chairman Richard Neal said in a letter to Internal Revenue Service (IRS) Commissioner Charles Rettig. “Those concerns lack merit.”

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United States Secretary of the Treasury Steven Mnuchin said the administration would respond by the revised deadline.

“I’m sure we’ll respond by that deadline, not going to make a commitment prematurely whether we’ll be able to conclude a legal review by that deadline,” Mnuchin said. “We have people working on it diligently.”

Trump has refused to release his tax returns arguing that they are being audited, a claim rejected by the IRS. There have been reports that Trump engaged in “dubious tax schemes” that included “instances of outright fraud.”

Most of the money Trump received from his father’s real estate empire in the 1990s apparently came through tax dodges. The figure would amount to at least $413 million in today’s dollars.