WASHINGTON — Growing uncertainty about Federal Reserve Board Chairman Ben Bernanke's role in pushing Bank of America Corp. to go through with its deal to buy Merrill Lynch & Co. is likely to delay regulatory restructuring plans and give ammunition to those seeking to prevent the central bank from receiving more power.

The White House has said it hopes to finalize by yearend a regulatory revamp that would give the Fed sweeping new powers over the country's largest firms.

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