Mitt Romney is going after Republican presidential candidate Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE for not yet releasing his taxes.



"Frankly, I think we have a good reason to believe that there's a bombshell in Donald Trump's taxes," the 2012 GOP nominee told Fox News on Wednesday.



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"I think there's something there. Either he's not anywhere near as wealthy as he says he is or he hasn't been paying the kind of taxes we would expect him to pay, or perhaps he hasn't been giving money to the vets or to the disabled like he's been telling us he's doing."Romney said it's suspicious that every time Trump is asked about his taxes, he "dodges" and "delays."He added that Trump likes to "tell people how well he's done" but has not yet let people look at his taxes."We're talking about taxes already filed, back taxes. And my back taxes, when I ran in 2012, my back taxes I put out in January of 2012," he said.

Trump shot back on Twitter, mocking Romney’s defeat in the 2012 election.

Mitt Romney,who totally blew an election that should have been won and whose tax returns made him look like a fool, is now playing tough guy — Donald J. Trump (@realDonaldTrump) February 24, 2016

Romney said he is sensitive to the tax issue because it affected his own run for the White House.



"They were all over me for my taxes, became a big issue, but I put my taxes out in January of 2012, and that gave people a chance to digest it and decide whether I was going to be the nominee or not," he said.



Senate Minority Leader Harry Reid Harry Mason ReidSenate Republicans signal openness to working with Biden Mellman: The likely voter sham Bottom line MORE (D-Nev.) lobbed similar attacks at Romney during his 2012 campaign.



Reid insinuated that Romney wasn't releasing his tax returns because they showed him paying a very low effective tax rate.

Romney was criticized during his campaign for not releasing his pre-2010 tax returns. He ultimately gave two years of information and a summary of returns dating back to 1990.

Reid said last year he didn't regret the attacks and he did what he "felt" he had to.

Romney also criticized Trump's rivals Marco Rubio Marco Antonio RubioFlorida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings MORE and Ted Cruz Rafael (Ted) Edward CruzLoeffler calls for hearing in wake of Netflix's 'Cuties' Health care in the crosshairs with new Trump Supreme Court list 'Parks and Rec' cast members hosting special reunion to raise money for Wisconsin Democrats MORE for not releasing their taxes yet.



Romney said the candidates should get their taxes out in the public so voters can see whether there are any issues, noting they will give voters a sense of whether the candidates have been telling the truth about themselves.



"The voters have a right to see those tax returns before they decide who our nominee ought to be," he said.



"People have a right to know if there's a problem in those taxes before they decide who our nominee is going to be."



Updated at 6:23 p.m.