Internal Revenue Service

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** FILE ** In this May 22, 2013, file photo, then Internal Revenue Service official Lois Lerner refuses to answer questions as the House Oversight Committee holds a hearing to investigate the extra scrutiny the IRS gave tea party and other conservative groups that applied for tax-exempt status, on Capitol Hill in Washington. (AP Photo/J. Scott Applewhite, File)

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Illustration on IRS targeting of 501(c)4s by Alexander Hunter/The Washington Times

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Internal Revenue Service Commissioner John Koskinen's remarks come at a busy time for the IRS. Not only are six investigations underway over possibly politicized audits, but tax season is in full gear, and the IRS is set to play a critical role in enforcing the insurance mandate at the heart of President Obama's Affordable Care Act. (Associated Press)