CNN — Mitt Romney responded to recent Democratic-led attacks on his personal finances, suggesting Wednesday he had no intention of meeting their demand to release tax documents dating back prior to 2010.

"The Democrats are always going to be critics. We have released all of the financial statements required by law and two years of tax returns," Romney said on Fox Business Network.

Over the last week, President Barack Obama's campaign and national Democrats have been blasting Romney over reports that the candidate holds offshore investments in places considered to be tax havens for Americans--Bermuda, the Cayman Islands and Switzerland.

On Tuesday, Vice President Joe Biden launched one of the campaign's harshest lines of attack yet, calling on Romney to "show your papers" during a speech in Las Vegas.

Romney's campaign has been pointing to the fact that it released the candidate's tax returns for 2010 and an estimate for 2011, as well as further financial disclosure documents required by federal election law.

Romney, whose worth is valued up to $256 million, said Wednesday he'll put out his most recent year of tax returns "as soon as that's prepared."

"Tax information is there, other financial disclosure is there; the same level of information that John McCain and John Kerry for that matter released when they were running for president," Romney said.

Also in the interview, Romney responded to those who say he's not tough enough in fending off attacks on the campaign trail.

"I respond to the attacks that come, but they say in politics if you are responding, you are losing," he said. "I think the better course for our campaign is to respond to the attacks as being completely off base."

And as speculation swirls over when Romney will announce his running mate pick, the candidate declined Wednesday to give any hint into the decision-making process.

"I can't tell you anything about the VP process. If I did, I would have to come after you with my 'Men in Black' flashlight and erase your memory," Romney said referring to the popular movie.

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CNN's Ashley Killough and Shawna Shepherd contributed to this report.

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