Sen. Carl Levin (D-MI) said Monday that he was anxious about the influence of secret money in the 2012 elections.

“The thing that worries me frankly the most is the huge amount of hidden money which is going to get into — it already is in — the Romney campaign,” he said on Current TV’s War Room.

“The Super PAC money worries me. The fact that Mr. Romney will not disclose who is bundling his money, he is keeping that secret as well… It’s bad enough that we have these unlimited amounts of money that go into Super PACs.”

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The Supreme Court’s 2010 Citizens United ruling struck down key provisions of the federal McCain-Feingold campaign finance reform law and gave rise to Super PACS, which can raise an unlimited amount of money to influence federal elections as long as they do not directly coordinate with a candidate’s campaign.

But Levin noted that although Congress could not limit political contributions, they could still require Super PACs to disclose their donors.

“We have a bill that would do that, that was filibustered by the Republicans and we could not overcome the filibuster,” he explained.

Watch video, courtesy of Current TV, below: