Internal Revenue Service

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Former IRS Commissioner Douglas H. Shulman, whose term expired in November, will be on Capitol Hill this week to testify about the agency's extra scrutiny of tea party-related groups. (Associated Press)

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The Tea Party Patriots plan to "rein in the IRS" through nationwide protests at Internal Revenue Service offices on Tuesday as it taps into public outrage. (Tea Party Patriots)

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Ousted IRS chief Steven Miller testifies on Capitol Hill in Washington, Friday, May 17, 2013, before the House Ways and Means Committee hearing on the extra scrutiny the IRS gave Tea Party and other conservative groups that applied for tax-exempt status. (AP Photo/J. Scott Applewhite)

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** FILE ** Steven Miller (right), the ousted chief of the Internal Revenue Service, answers questions on May 17, 2013, on Capitol Hill from the House Ways and Means Committee as it holds a hearing on the IRS practice of targeting applicants for tax-exempt status based on political leanings. At left is J. Russell George, the Treasury inspector general for tax administration. (Associated Press)

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Ousted IRS chief Steve Miller is sworn in on Capitol Hill, in Washington on May 17, 2013, prior to testifying before the House Ways and Means Committee hearing on the Internal Revenue Service's practice of targeting applicants for tax-exempt status based on political leanings. (Associated Press)

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** FILE ** President Obama speaks on the Internal Revenue Service's targeting of conservative groups for extra tax scrutiny in the East Room of the White House in Washington on Wednesday, May 15, 2013. Mr. Obama announced the resignation of Acting IRS Commissioner Steven Miller. (AP Photo/Jacquelyn Martin)

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Rep. Michele Bachmann, R-Minn., chairwoman of the Tea Party Caucus, listens at left as while Sen. Rand Paul, R-Ky., speaks during a news conference with Tea Party leaders about the IRS targeting Tea Party groups, Thursday, May 16, 2013, on Capitol Hill in Washington. (Associated Press)

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President Obama speaks on the Internal Revenue Service's targeting of conservative groups for extra tax scrutiny in the East Room of the White House in Washington on Wednesday May 15, 2013. Mr. Obama announced the resignation of Acting IRS Commissioner Steven Miller. (AP Photo/Susan Walsh)