Republic Bancorp Inc. has accused the Federal Deposit Insurance Corp. of multiple abuses of its authority, escalating a battle over refund-anticipation loans.

The Louisville, Ky., company filed a lawsuit Monday in the U.S. District Court for the Western District of Kentucky against the agency. The suit says the FDIC improperly used its supervisory power to try to stop the company's RAL business and to collect information for a pending arbitration hearing on the matter.

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