A watchdog group is suing the Federal Election Commission to re-open an investigation into four campaign operatives, including the national finance chair for Sen. Marco Rubio's presidential bid.

Citizens for Responsibility and Ethics in Washington believes Wayne Berman, now the national finance chairman for Sen. Marco Rubio's presidential campaign, may have lied to the FEC about his involvement in an organization that was formed in 2010 to promote economic growth but which the FEC later found was significantly involved in campaign activity.

"It is inexcusable that no one has been punished for what even the FEC's investigators believe to be a clear violation of the law," said CREW Executive Director Noah Bookbinder. "Laws only work if they are enforced; we are asking the court to remind the FEC it must do its job."

According to Bookbinder, Berman and two others "may have violated the law" by making false statements to investigators and obstructing the investigation into the group. Bookbinder said the three involved were paid more than $1 million that was initially intended to pay for television ads.

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