National City is demanding Bernie Sanders' presidential campaign pay nearly $30,000 for police overtime and other costs from a May rally.
The San Diego Union-Tribune reports that National City demanded $28,337 in a letter sent Tuesday after several collection attempts.
The costs are from a rally at Kimball Park on May 21, shortly before California's presidential primary.
The letter says the city will "pursue all available legal remedies" if the bill isn't paid by next Monday.
National City Director of Neighborhood Services Armando Vergara says the Sanders campaign maintains that police overtime costs are the responsibility of the Secret Service.
The city disagrees.
The rally's media contact didn't immediately respond to a phone message from The Associated Press on Wednesday.
