House Ways and Means Committee Chairman Richard Neal Richard Edmund NealRep. Bill Pascrell named chair of House oversight panel Rep. Cedric Richmond set to join House Ways and Means Committee Coons beats back progressive Senate primary challenger in Delaware MORE (D-Mass.) on Saturday sent a second letter to the IRS in his push to obtain President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's tax returns, after the agency missed his original deadline to provide the documents.

In the new letter, Neal said that concerns about his request "lack merit" and that he expects a response from the IRS by 5 p.m. on April 23.

"Please know that, if you fail to comply, your failure will be interpreted as a denial of my request," Neal wrote in a letter to IRS Commissioner Charles Rettig.

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Neal had sent a letter earlier this month to Rettig requesting that the IRS provide six years' worth of Trump's personal and business tax returns by April 10.

The Democratic chairman said that his committee is interested in the returns because it is considering legislative proposals and oversight relating to tax laws, including the extent to which the IRS enforces tax laws against a sitting president.

Treasury Secretary Steven Mnuchin Steven Terner MnuchinOn The Money: Powell, Mnuchin stress limits of emergency loans | House seeks to salvage vote on spending bill | Economists tell lawmakers: Kill the virus to heal the economy Economists spanning spectrum say recovery depends on containing virus Powell, Mnuchin stress limits of current emergency lending programs MORE responded to the letter, saying that the department was unable to finish its review of the request by April 10. He said Treasury would be consulting with the Justice Department on the matter and that he would be supervising Treasury's handling of the request.

Mnuchin told reporters on Saturday, at the end of International Monetary Fund and World Bank meetings, that the new April 23 deadline was "arbitrary." He said he expected Treasury to respond to Neal's letter by that date but didn't commit that the department would finish its review of the chairman's request by then.

“The implications of this is way beyond, in my mind, a congressional oversight issue and a precedent issue," he said, according to a transcript provided by the Treasury Department. "The issue is, I feel a responsibility that we get this right and the IRS does not become weaponized like it was under the Nixon administration.”

An IRS spokesperson said the agency had no immediate comment on the latest letter.

Trump and his allies have made it clear that they disapprove of the request, arguing that it lacks a legitimate legislative purpose. They've argued that Neal's stated reason for wanting the returns is just pretext and that he really wants to score political points against Trump.

In his new letter, Neal rejected concerns raised by Republicans and said that "judicial precedent commands that none of the concerns raised can legitimately be used to deny the Committee’s request."

Neal said that the section of the tax code that he made the request under is "unambiguous and raises no complicated legal issues that warrant supervision or review" by Treasury or the Justice Department. The tax code provision states that the Treasury secretary "shall furnish" tax returns upon request of the chairmen of Congress's tax committees, so long as a committee reviews them in closed session.

The Ways and Means Committee chairman also said that "there is no valid basis to question the legitimacy of the Committee’s legislative purpose here." He added that the Supreme Court has found that Congress has broad investigative power.

"It is not the proper function of the IRS, Treasury, or Justice to question or second guess the motivations of the Committee or its reasonable determinations regarding its need for the requested tax returns and return information," Neal said.

Additionally, Neal argued that concerns about what the Ways and Means Committee may do with Trump's tax returns if they obtain them are "baseless."

"The IRS, Treasury, and Justice must assume that the Committee Members, like all government officials, will act properly in the conduct of their official duties," he wrote.

Updated: 4:21 p.m.