Marco Rubio Caught In Second Campaign Finance Violation

Marco Rubio, who recently paid a fine for improper contributions to his 2010 Senate campaign, is now being asked by the Federal Election Commission to explain irregular contributions to his PAC.

Rubio’s Reclaim America PAC was the subject of an FEC letter asking for details about a contribution over the legal limit, as well as another prohibited corporate contribution.

Rubio’s PAC told the FEC it returned $5,000 to donors who had broken the contribution rules, but reportedly did not address the mysterious prohibited donation from Van Wagner Miami, an advertising firm.

The junior senator from Florida has topped many lists of likely running mates for Republican presidential candidate Mitt Romney, though he has denied interest in the position.