IRS official Lois Lerner leaves a House Oversight Committee hearing on Capitol Hill in Washington on Wednesday, May 22, 2013. Ms. Lerner told the committee she did nothing wrong and then invoked her constitutional right to not answer lawmakers' questions. At left is former IRS Commissioner Douglas Shulman; at right is Deputy Secretary of the Treasury Neal S. Wolin. (AP Photo/Carolyn Kaster)

Photo by: Carolyn Kaster

IRS official Lois Lerner leaves a House Oversight Committee hearing on Capitol Hill in Washington on Wednesday, May 22, 2013. Ms. Lerner told the committee she did nothing wrong and then invoked her constitutional right to not answer lawmakers' questions. At left is former IRS Commissioner Douglas Shulman; at right is Deputy Secretary of the Treasury Neal S. Wolin. (AP Photo/Carolyn Kaster)