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ST. LOUIS – Officials with U.S. Rep. Ann Wagner’s campaign say a political mailer criticizing her on immigration issues is illegal.

The St. Louis Post-Dispatch reports that the mailer has circulated to St. Louis County residents in the final weeks before the Nov. 6 election. Wagner, a Republican, is facing a challenge from Democrat Cort VanOstran in Missouri’s 2nd District.

The mailer fails to identify who paid for it, which is required by law. It claims that Wagner is “complicit in the separation of families,” citing her yes vote on a border security and immigration reform bill.

Wagner’s campaign accuses Democrats of “spreading lies and using illegal dark money.”

VanOstran’s campaign manager, Claire Botnick, says the campaign had no involvement with the ad. Botnick says campaign finance reform is among VanOstran’s top priorities.