Federal Reserve Board Chairwoman Janet Yellen testifies in Washington, D.C.

Sen. Mike Johanns (R-NE) listens as Federal Reserve Board Chairwoman Janet Yellen testifies on the Federal Reserve's Semiannual Monetary Policy Report to the Congress, during a Senate Banking, Housing and Urban Affairs Committee hearing in Washington, D.C. on July 15, 2014. UPI/Kevin Dietsch