John Koskinen

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Witness: Internal Revenue Service Commissioner John Koskinen tried to assure lawmakers that taxpayers would be treated in a fair manner. (Associated Press)

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**FILE** House Oversight Committee Chairman Darrell Issa (right), California Republican, with the committee's ranking member, Rep. Elijah Cummings, Maryland Democrat, continues his probe of whether tea party groups were improperly targeted for increased scrutiny by the Internal Revenue Service as the panel questions IRS Commissioner John Koskinen on March 26, 2014, during a hearing on Capitol Hill in Washington. (Associated Press)

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Internal Revenue Service (IRS( Commissioner John Koskinen arrives on Capitol Hill in Washington, Wednesday, Feb. 5, 2014, to testify before the House Ways and Means Oversight Subcommittee hearing on the IRS. (AP Photo/J. Scott Applewhite)

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"I don't know if a decision has been made about that," IRS Commissioner John Koskinen (left) told Rep. Sam Johnson (right), a Texas Republican who wanted to know whether the IRS will sue those who refuse to obtain health insurance or pay the tax penalty required under Obamacare's individual mandate. (associated press photographs)

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Internal Revenue Service Commissioner John Koskinen says he is eager to put behind him a scandal about the agency's targeting of certain tax exempt organizations. (Associated Press)

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Internal Revenue Service (IRS) Commissioner John Koskinen arrives on Capitol Hill in Washington, Wednesday, Feb. 5, 2014, to testify before the House Ways and Means Oversight subcommittee hearing focusing on a variety of issues facing the IRS, including the ongoing investigation into the IRS targeting of certain tax exempt organizations and IRS responsibilities under the Affordable Care Act. (AP Photo/J. Scott Applewhite)

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John Koskinen, President Barack Obama's choice to head the Internal Revenue Service (IRS) testifies on Capitol Hill in Washington, Tuesday, Dec. 10, 2013, before the Senate Finance Committee hearing on his nomination. Koskinen, 74, is a retired corporate and government official with experience managing numerous organizations in crisis. (AP Photo/J. Scott Applewhite)

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Sen. Orrin G. Hatch, Utah Republican, told John Koskinen that he is "very favorably disposed toward your nomination and want to see you confirmed" to head the IRS. (ASSOCIATED PRESS)