Share
1 of 10
IRS Commissioner John Koskinen is facing tough questions about an unknown number of missing agency e-mails due to hard drive crashes. Republicans are especially interested in e-mails belonging to former IRS official Lois Lerner as lawmakers investigate the agency's targeting of conservative tax-exempt groups. Cliff Owen/AP
Lois Lerner is sworn in before testifying to the House Oversight and Government Reform Committee in May 2013. As the former IRS director of exempt organizations, Lerner headed the division involved in targeting conservative groups. She invoked her constitutional right against self-incrimination and refused to answer questions from the congressional committee. KAREN BLEIER/AFP/Getty Images/File
Sens. Max Baucus, left, and Orrin Hatch, co-chairmen of the Senate Finance Committee, confer in Washington in May 2013, during a hearing regarding the targeting of conservative groups. Gary Cameron/REUTERS/landov
Former IRS Commissioner Douglas Shulman is sworn in prior to testifying before the Senate Finance Committee in May 2013. Shulman was at the helm of the IRS during most of the period that agents were targeting conservative groups. Shulman denied full awareness of what was happening at the time, saying subordinates failed to inform him of the details. Win McNamee/Getty Images
Rep. Darrell Issa, chairman of the House Oversight Committee, has held multiple hearings on the IRS controversy. Alex Wong/Getty Images
Steve Miller, former acting commissioner of the IRS, testifies before the House Ways and Means Committee in May 2013. The committee held a hearing to examine revelations that the IRS singled out for scrutiny conservative groups seeking tax-exempt status. Alex Wong/Getty Images
Rep. Dave Camp, chairman of the House Ways and Means Committee, is among the GOP members who have sought to depict the controversy as government gone wild, with the IRS abusing conservative groups and other political foes of the administration. JASON REED/Reuters/LANDOV
U.S. Attorney General Eric Holder testifies during a hearing of the House Judiciary Committee in May 2013. The day before, Holder announced a Justice Department investigation into any possible criminal wrongdoing by the IRS. BRENDAN SMIALOWSKI/AFP/Getty Images
Former acting IRS Commissioner Daniel Werfel, left, testifies before the House Financial and General Government Subcommittee with Treasury Inspector General for Tax Administration J. Russell George, right, in June 2013. Win McNamee/Getty Images
Treasury Inspector General for Tax Administration J. Russell George is sworn in before testifying in Washington in May 2013. According to his report, the IRS developed and followed a faulty policy for determining whether applicants were engaged in political activities, which would disqualify the groups from receiving tax-exempt status. NICHOLAS KAMM/AFP/Getty Images
