Senator Elizabeth Warren, a Democrat from Massachusetts, listens as Janet Yellen, chair of the U.S. Federal Reserve, not pictured, speaks during a Senate Banking Committee hearing in Washington, D.C., U.S., on Thursday, Feb. 27, 2014. Yellen repeated that the central bank is likely to maintain its strategy of gradually trimming asset purchases even as it takes time for the job market to recover. Photographer: Andrew Harrer/Bloomberg via Getty Images