Internal Revenue Service Director of Exempt Organizations Lois Lerner as she was sworn in at a hearing held Wednesday by the House Committee On Oversight & Government Reform. Chip Somodevilla/Getty Images hide caption

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Outgoing acting Internal Revenue Service Commissioner Steven Miller. Nicholas Kamm /AFP/Getty Images hide caption

itoggle caption Nicholas Kamm /AFP/Getty Images

Outgoing acting Internal Revenue Service (IRS) Commissioner Steve Miller as he was being sworn in Friday before a House Ways and Means committee hearing. Nicholas Kamm /AFP/Getty Images hide caption

itoggle caption Nicholas Kamm /AFP/Getty Images