"It is imperative that we compel the FEC to change its regulations to properly reflect the laws enacted by Congress," Van Hollen said.
This is not Van Hollen's first attempt to strengthen the FEC's disclosure regulations. He helped successfully shepherd the DISCLOSE Act through the House last year, but the bill failed to pass the Senate.
Van Hollen's lawsuit comes a day after that the White House confirmed it is in the process of drafting an executive order that would require federal contractors to disclose any donations made to political parties or organizations. The coordinated push for greater disclosure underlines the Democrats' desire to limit campaign spending by outside groups ahead of the 2012 election cycle. In 2010, Democrats took issue with the amount of money spent on behalf of the GOP by organizations like the U.S. Chamber of Commerce.