Internal Revenue Service

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** FILE ** In this Friday, March 22, 2013, file photo, the exterior of the Internal Revenue Service building in Washington, is shown. (AP Photo/Susan Walsh, File)

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IRS, FBI and Health and Human Services criminal investigators raid the accounting firm of Stillwater Mayor Ken Harycki on Thursday, March 20, 2014 in Stillwater, Minn. Agents from agencies including the FBI, ATF and the Internal Revenue Service conducted the raid Thursday morning at Customized Payroll Solutions. IRS special agent Vicki Petricka said the raid was part of an enforcement action, but would not elaborate. In a statement, Stillwater Mayor Ken Harycki said the raid involved a former client. (AP Photo/The Star Tribune, McKenna Ewen ) MANDATORY CREDIT; ST. PAUL PIONEER PRESS OUT; MAGS OUT; TWIN CITIES TV OUT

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IRS, FBI and Health and Human Services criminal investigators raid the accounting firm of Stillwater Mayor Ken Harycki on Thursday, March 20, 2014 in Stillwater, Minn. Agents from agencies including the FBI, ATF and the Internal Revenue Service conducted the raid Thursday morning at Customized Payroll Solutions. IRS special agent Vicki Petricka said the raid was part of an enforcement action, but would not elaborate. In a statement, Stillwater Mayor Ken Harycki said the raid involved a former client. (AP Photo/The Star Tribune, McKenna Ewen ) MANDATORY CREDIT; ST. PAUL PIONEER PRESS OUT; MAGS OUT; TWIN CITIES TV OUT

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IRS, FBI and Health and Human Services criminal investigators raid the accounting firm of Stillwater Mayor Ken Harycki on Thursday, March 20, 2014 in Stillwater, Minn. Agents from agencies including the FBI, ATF and the Internal Revenue Service conducted the raid Thursday morning at Customized Payroll Solutions. IRS special agent Vicki Petricka said the raid was part of an enforcement action, but would not elaborate. In a statement, Stillwater Mayor Ken Harycki said the raid involved a former client. (AP Photo/The Star Tribune, McKenna Ewen ) MANDATORY CREDIT; ST. PAUL PIONEER PRESS OUT; MAGS OUT; TWIN CITIES TV OUT

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Senate Majority Leader Harry Reid of Nev. makes a cutting gesture across his neck, referencing House Oversight Committee Chairman Rep. Darrell Issa, R-Calif., who caused an uproar last week when he made the same gesture to order microphones cut as the top Democrat on his panel was trying to speak about the Internal Revenue Service scandal over targeting of conservative political groups, Tuesday, March 11, 2014, during a news conference on Capitol Hill in Washington, Tuesday, March 11, 2014. Reid said that he thought the accusations of IRS misdeeds deserved answers. (AP Photo/J. Scott Applewhite)

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Senate Majority Leader Harry Reid of Nev. makes a cutting gesture across his neck, referencing House Oversight Committee Chairman Rep. Darrell Issa, R-Calif., who caused an uproar last week when he made the same gesture to order microphones cut as the top Democrat on his panel was trying to speak about the Internal Revenue Service scandal over targeting of conservative political groups, Tuesday, March 11, 2014, during a news conference on Capitol Hill in Washington, Tuesday, March 11, 2014. Reid said that he thought the accusations of IRS misdeeds deserved answers. (AP Photo/J. Scott Applewhite)

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House Speaker John Boehner, Ohio Republican, said Rep. Darrell Issa was within his rights to end Wednesday's oversight committee hearing after former IRS employee Lois G. Lerner refused to answer questions about the tax agency's tea party targeting. (associated press)

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House Oversight and Government Reform Committee Chairman Rep. Darrell E. Issa prepares to leave as ranking member Rep. Elijah E. Cummings begins his statement Wednesday at a hearing at which former Internal Revenue Service official Lois G. Lerner invoked her constitutional right not to incriminate herself. (associated press)