Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE used Tax Day to take a jab at Treasury Secretary Steven Mnuchin Steven Terner MnuchinHillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars Treasury: Trump's payroll tax deferral won't hurt Social Security Treasury sanctions individuals, groups tied to Russian malign influence activities MORE and IRS Commissioner Charles Rettig over their refusal to release 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’s tax returns.

“Millions of Americans will put tax checks in the mail today. Meanwhile, the secretary of the treasury and head of the IRS continue to refuse to turn over Trump's tax returns to Congress for reasons even they can't clearly articulate,” the 2016 Democratic presidential nominee and former secretary of State tweeted Monday.

Millions of Americans will put tax checks in the mail today. Meanwhile, the secretary of the treasury and head of the IRS continue to refuse to turn over Trump's tax returns to Congress for reasons even they can't clearly articulate. #TaxDay — Hillary Clinton (@HillaryClinton) April 15, 2019

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House Ways & Means Committee Chairman Richard Neal Richard Edmund NealAARP endorses Democrats' measure to overturn Trump payroll tax deferral Pelosi, Democrats unveil bills to rein in alleged White House abuses of power Rep. Bill Pascrell named chair of House oversight panel MORE (D-Mass.) had requested Trump’s tax returns by April 10, but the Treasury Department missed that deadline.

Mnuchin said at the time that the department was discussing the issue with the Justice Department "to ensure that our response is fully consistent with the law and the Constitution.” Mnuchin has said he would supervise the Treasury’s review "to ensure that taxpayer protections and applicable laws are scrupulously observed, consistent with my statutory responsibilities."

Neal later imposed a new deadline of April 23, telling Rettig that "none of the concerns raised can legitimately be used to deny the committee's request."

Trump broke with tradition among presidents and presidential candidates and declined to release his returns, citing an ongoing IRS audit.

Last weekend, acting White House chief of staff Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE said Democrats would “never” see Trump’s tax returns and said the issue had already been litigated in the 2016 presidential election.