While the event allegedly cost more than $1.2 million, the indictment said, Rosen reported contributions of about $400,000, knowing the figure to be false.

The indictment charged that Rosen provided some documents to the an FEC compliance officer but withheld the true costs of the event and provided false documents to substantiate the lower figure.

In one instance, Rosen obtained and delivered a fraudulent invoice stating the cost of a concert associated with the gala was $200,000 when he know that figure was false, according to the indictment. The actual cost of the concert was more than $600,000.

Each of the four counts of making a false statement carries a maximum penalty of up to five years in prison and up to $250,000 in fines upon conviction.

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Editor's note: