WASHINGTON — The Federal Deposit Insurance Corp.'s growing involvement in efforts to rescue the financial system is raising concerns that its core mission may be blurred.

The agency's role has greatly expanded as the Treasury Department has turned to the FDIC to run a critical piece of a plan to remove toxic assets from bank balance sheets. Congress is also weighing whether to grant the FDIC the power to resolve systemically important nonbanks, and its borrowing authority from the Treasury is poised to more than triple, to $100 billion.

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