Acting IRS Commissioner Danny Werfel, left, testifies before the House Financial and General Government subcommittee, alongside Treasury Inspector General for Tax Administration J. Russell George. Win McNamee/Getty Images hide caption

itoggle caption Win McNamee/Getty Images

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

itoggle caption Chip Somodevilla/Getty Images

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