Romney prods Trump: 'Show voters your back taxes'
© Greg Nash

Mitt Romney is stepping up his fight with Donald TrumpDonald John TrumpTrump opens new line of impeachment attack for Democrats Bloomberg to spend 0M on anti-Trump ads in battleground states New witness claims first-hand account of Trump's push for Ukraine probes MORE, daring the GOP presidential front-runner to release his tax returns.

“Methinks the Donald doth protest too much,” tweeted Romney, the 2012 GOP nominee. “Show voters your back taxes, @realDonald Trump,” he added with the hashtag #WhatIsHeHiding?”

Romney prodded Trump for his tax returns late Wednesday, suggesting they may contain “bombshell” information for voters.

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“I think there’s something there,” the former Massachusetts governor said on Fox News. “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 the disabled like he’s been telling us he’s been doing.”

Trump responded Wednesday night that he is in “no rush” to release his back taxes, adding that his extensive business dealings require careful documentation.

“My returns are extremely complex, and I’ll make a determination at the right time,” he said on CNN of releasing his records.

The outspoken billionaire also lashed out at Romney, needling him for losing “very badly” against President Obama in 2012.

Senate Minority Leader Harry ReidHarry Mason ReidThe Memo: Democrats confront prospect of long primary Bottom Line Lobbying world MORE (D-Nev.) made Romney’s own back taxes a 2012 campaign issue, suggesting the businessman was taking advantage of certain filing loopholes.

Romney eventually released his returns dating back to 1990. He is also urging Ted CruzRafael (Ted) Edward CruzOvernight Defense: Erdoğan gets earful from GOP senators | Amazon to challenge Pentagon cloud contract decision in court | Lawmakers under pressure to pass benefits fix for military families Erdoğan gets earful from GOP senators at White House Senators confirm Erdoğan played 'propaganda' video in White House meeting MORE and Marco RubioMarco Antonio RubioGOP senators plan to tune out impeachment week Republicans warn election results are 'wake-up call' for Trump Paul's demand to out whistleblower rankles GOP colleagues MORE, Trump’s main rivals for the GOP nomination, to do the same.