President Obama’s re-election campaign is calling on Mitt Romney to release his tax returns dating back to the 1980s, according to The Wall Street Journal.

Following a front-page Wall Street Journal article Thursday reporting that employees at Bain Capital, Romney’s former private-equity firm, were allowed to invest their retirement money in companies the firm acquired through a special share class, the Obama camp is seeking Romney’s old tax returns to see if they contain information about the investment arrangement…

“Today’s report raises additional questions about Gov. Romney’s manipulation of the tax laws,” Ben LaBolt, an Obama spokesman, told The Journal, adding that Romney “may have engaged in questionable maneuvers to drive up the value of his IRA.”