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Lois Lerner, head of the IRS unit that decides whether to grant tax-exempt status to groups, leaves after being dismissed from a House Oversight and Government Reform Committee hearing on Wednesday. J. Scott Applewhite/AP hide caption

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J. Scott Applewhite/AP

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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Chip Somodevilla/Getty Images

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

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Nicholas Kamm /AFP/Getty Images

Ousted IRS chief Steve Miller (right) and J. Russell George, a Treasury inspector general, take the oath before testifying on before the House Ways and Means Committee on Friday. Charles Dharapak/AP hide caption

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Charles Dharapak/AP

Former House Speaker Newt Gingrich in April 2012. Christian Gooden/St. Louis Post-Dispatch /MCT /Landov hide caption

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Christian Gooden/St. Louis Post-Dispatch /MCT /Landov

From 'Morning Edition': Newt Gingrich on the risk of Republican 'overreach'

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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

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Nicholas Kamm /AFP/Getty Images

The John Weld Peck Federal Building in Cincinnati, where many of the missteps by IRS workers who targeted conservative groups occurred. Al Behrman/AP hide caption

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Al Behrman/AP

Acting IRS Commissioner Steven Miller. (2009 file photo) Alex Wong/Getty Images hide caption

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Alex Wong/Getty Images