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This question has been raised several times, and now two Democratic congressmen are making it an official issue: How did Mitt Romney end up with so much money in his IRA - and more importantly, is it legal?

Romney’s most recent financial disclosure form revealed that his tax-deferred individual retirement account holds upwards of $100 million — an amount that awkwardly showcases his enormous wealth but also raises legal and ethical questions.

IRAs are intended to allow workers to put away modest sums of money each year in order to help finance a middle class retirement. The savings are tax deferred, but there’s a legal limit — now $6,000 — on how much each IRA holder can contribute annually.

Now top Democrats on the Budget, Ways and Means, and Education and Workforce Committees want to know how people of Romney’s wealth can end up with 100,000 times that much money in a single IRA, and how much the tax and investment strategies they employ cost the Treasury in revenue every year.

In a letter Thursday to senior officials at the Treasury and Labor departments, Reps. George Miller (D-CA), Sander Levin (D-MI), and Chris Van Hollen (D-MD) want to know: Is this legal? How easy is this strategy to get away with? How much does it cost the government every year? And what can be done to end the practice?

“[W]e are alarmed to learn that wealthy taxpayers may be taking advantage of a tax subsidy that is designed to provide for retirement to instead accumulate massive amounts of tax-sheltered assets,” the lawmakers write. “Given your commitment to the rule of law and equitable treatment of taxpayers, we hope that you will evaluate this issue carefully to ensure that a select few are not being provided with a loophole that allows for wrongful tax evasion.”