NBC NEWS: Campaign Watchdogs: Pro-Rubio TV Ads Are Breaking The Law

"I think they're breaking the law," Paul S. Ryan of the Campaign Legal Center tells NBC News.

Earlier this month, the Campaign Legal Center and Democracy 21, another campaign-finance watchdog, asked the Justice Department to launch an investigation into Conservative Solutions Project.

"The publicly available facts indicate that Conservative Solutions Project is little more than a single-candidate 501(c)(4), with no other mission than to advance the presidential aspirations of Marco Rubio," the Campaign Legal Center said in its statement calling for an investigation.

The statement added, "501(c)(4) 'social welfare' groups by statute must [promote] the common good and general welfare of the people of the community as a whole' rather than an individual candidate for political office."

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