(Committee Chairman U.S. Representative Darrell Issa (R-CA) holds a House Oversight and Government Reform Committee hearing on alleged targeting of political groups seeking tax-exempt status from by the Internal Revenue Service (IRS), on Capitol Hill in Washington, May 22, 2013. REUTERS/Jonathan Ernst)

(Committee Chairman U.S. Representative Darrell Issa (R-CA) holds a House Oversight and Government Reform Committee hearing in Washington, May 22, 2013. REUTERS/Jonathan Ernst)