Conservatives have criticized the new Internal Revenue Service rules for political dark money as an Obama administration attempt to gain political advantage. Susan Walsh/AP hide caption

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Lois Lerner, the head of the IRS division that handles applications for tax-exempt status, listens to opening statements during a hearing before the House Oversight and Government Reform Committee before refusing to testify on May 22. Chip Somodevilla/Getty Images hide caption

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Ty Warner, creator of Beanie Babies toys, attends the 2003 American International Toy Fair in a rare appearance to celebrate the 10th anniversary of the Beanie Babies toy line. Chris Hondros/Getty Images hide caption

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A waiter serves patrons at Tony's Restaurant, part of the Casablanca Hotel in New York's Times Square. The custom at some restaurants of automatic gratuities for larger parties might change because of an IRS rule change. Don Emmert/AFP/Getty Images hide caption

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House Oversight and Government Reform Committee Chairman Darrell Issa (right) speaks with the committee's ranking Democrat, Elijah Cummings, during a hearing last month. Charles Dharapak/AP hide caption

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Outgoing acting Internal Revenue Service Commissioner Steve Miller (right) and Treasury Inspector General for Tax Administration J. Russell George are sworn in before a full House Ways and Means Committee hearing in May. Nicholas Kamm/AFP/Getty Images hide caption

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It would be a vast understatement to say that Republican Rep. Darrell Issa (right) of California and Democratic Rep. Elijah Cummings of Maryland don't see eye to eye on the IRS scandal's latest development. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP