Internal Revenue Service

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** FILE ** Rep. Darrell Issa, R-Calif., the chairman of the House Oversight Committee, questions Internal Revenue Service Commissioner John Koskinen 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. (AP Photo/J. Scott Applewhite)

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The lawyer of former Internal Revenue Service official Lois G. Lerner said Repbulicans are using the the IRS probe to drum up support among GOP voters. (Associated)

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Rep. Darrell E. Issa, California Republican and the chairman of the House Oversight and Government Reform Committee, has a rare light moment as his panel questions Internal Revenue Service Commissioner John Koskinen in the probe of whether tea party groups were improperly targeted for scrutiny. (Associated Press)

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IRS Commissioner John Koskinen said in an email to employees that bonuses were an appropriate way for taxpayers to reward the agency that polices them. "I believe that rewarding our high-performing employees is a vital investment for our nation's tax system," he said. (Associated Press)

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IRS Flying eMail Illustration by Greg Groesch/The Washington Times

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National Edition News cover for June 21, 2014 - IRS commish: No apologies for losing Lerner emails: Internal Revenue Service (IRS) Commissioner John Koskinen is sworn in on Capitol Hill in Washington, Friday, June 20, 2014, prior to testifying before the House Ways and Means Committee hearing on whether tea party groups were improperly targeted for increased scrutiny by the IRS. The IRS asserts it can't produce emails from seven 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 who has invoked her Fifth Amendment right at least nine times to avoid answering lawmakers' questions. (AP Photo/J. Scott Applewhite)