WASHINGTON, DC - MAY 21: Ranking member U.S. Sen. Orrin Hatch (R-UT) (R) questions current and former IRS employees while the testify before the Senate Finance Committee as committee Chairman Sen. Max Baucus (D-MT) listens May 21, 2013 in Washington, DC. The committee heard testimony on the topic of on 'A Review of Criteria Used by the IRS to Identify 501(c)(4) Applications for Greater Scrutiny.'
WASHINGTON, DC - MAY 21: Acting IRS Commissioner Steven Miller departs after testifying before the Senate Finance Committee May 21, 2013 in Washington, DC. The committee heard testimony on the topic of on 'A Review of Criteria Used by the IRS to Identify 501(c)(4) Applications for Greater Scrutiny.'
WASHINGTON, DC - MAY 21: U.S. Sen. Pat Toomey (R-PA) questions current and former IRS employees while the testify before the Senate Finance Committee May 21, 2013 in Washington, DC. The committee heard testimony on the topic of on 'A Review of Criteria Used by the IRS to Identify 501(c)(4) Applications for Greater Scrutiny.'
Outgoing acting IRS Commissioner Steven Miller (C) talks to staff before a hearing of the Senate Finance Committee on Capitol Hill May 21, 2013 in Washington, DC. Acting IRS Commissioner Steven Miller and others appeared before to committee to testify about the targeting of politically conservative 501(c)(4) groups applying for tax exempt status.
Kathleen Sebelius, Secretary of Health and Human Services, gestures as she testifies to the Senate Finance Committee in Washington in this March 16, 2011 file photo. With the White House already reeling from three major controversies, some Republican lawmakers are zeroing in on what they perceive is another possible scandal tied to President Barack Obama's landmark health reform law just as it nears implementation. Republicans hope to target Health and Human Services Secretary Kathleen Sebelius.
J. Russell George, Treasury inspector general for tax administration, arrives during a hearing of the Senate Finance Committee on Capitol Hill May 21, 2013 in Washington, DC. Acting IRS Commissioner Steven Miller and others appeared before to committee to testify about the targeting of politically conservative 501(c)(4) groups applying for tax exempt status.