WASHINGTON — Federal Reserve Board Chairman Ben Bernanke was called upon on Tuesday to come to the defense of the Dodd-Frank Act as a growing group of bipartisan lawmakers continue to insist that the financial reform law did not eliminate "too big to fail."

The central banker's newest foe was none other than Sen. Elizabeth Warren, D-Mass., who thanked Bernanke for his support of the Consumer Financial Protection Bureau and then pressed him repeatedly on why regulators have not done more to rein in the big banks.

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