WASHINGTON — Federal Reserve Chair Janet Yellen found herself on the defensive Tuesday as Sen. Elizabeth Warren, D-Mass., cast doubt on a top staff member of the Fed, suggesting he was not committed to implementing the Dodd-Frank Act.

During an unusually aggressive bout of questioning for Yellen, particularly from a lawmaker generally regarded as supportive of the Fed chair, Warren questioned comments made by Fed General Counsel Scott Alvarez last year raising concerns with aspects of the financial reform law.

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