Internal Revenue Service Commissioner John Koskinen testifies under subpoena before the House Oversight Committee as lawmakers continue their probe of whether tea party groups were improperly targeted for increased scrutiny by the IRS, on Capitol Hill in Washington, Monday, June 23, 2014. The IRS asserts it can't produce emails from several officials connected to the tea party investigation because of computer crashes, including the emails from Lois Lerner, the former IRS official at the center of the investigation. (AP Photo/J. Scott Applewhite)

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