Donald Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE mocked former Republican presidential nominee Mitt Romney for not releasing his tax returns until late in the 2012 campaign in a tweet getting new attention as the date passes for the current GOP nominee.

"Mitt Romney didn’t show his tax return until September 21, 2012, and then only after being humiliated by [then-Senate Majority Leader Harry Reid Harry Mason ReidThe Supreme Court vacancy — yet another congressional food fight Trump seeks to turn around campaign with Supreme Court fight On The Trail: Battle over Ginsburg replacement threatens to break Senate MORE (D-Nev.)]!” Trump, who continues to withhold his own returns, tweeted earlier this year.

Mitt Romney didn't show his tax return until SEPTEMBER 21, 2012, and then only after being humiliated by Harry R! A bad messenger for estab! — Donald J. Trump (@realDonaldTrump) February 28, 2016

Critics have raised questions about Trump’s wealth, real estate deals and foreign investments in the absence of public records.

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If Trump does not release his tax returns before the presidential election, he would become the first presidential nominee from either party to withhold them since 1976.

During a GOP presidential debate in late February, Trump claimed he couldn’t release his personal tax returns, because he was facing an audit by the Internal Revenue Service (IRS).

"I'm being audited now for two or three years, so I can't do it until the audit is finished, obviously,” Trump said on Feb. 26. "And I think people would understand that."

The IRS has stated that nothing is preventing from Trump from releasing his returns.

Two days later, Trump mocked Romney for not releasing his tax returns until Sept. 21 during the 2012 campaign.

The 2016 calendar has now rolled to Sept. 21, and Trump has yet to follow suit.