Outgoing acting Internal Revenue Service Commissioner Steve Miller (right) and Treasury Inspector General for Tax Administration J. Russell George are sworn in before a full House Ways and Means Committee hearing in May. Nicholas Kamm/AFP/Getty Images hide caption

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It would be a vast understatement to say that Republican Rep. Darrell Issa (right) of California and Democratic Rep. Elijah Cummings of Maryland don't see eye to eye on the IRS scandal's latest development. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP

Lois Lerner, head of the IRS unit that decides whether to grant tax-exempt status to groups, leaves after being dismissed from a House Oversight and Government Reform Committee hearing on Wednesday. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP

The John Weld Peck Federal Building in Cincinnati, where many of the missteps by IRS workers who targeted conservative groups occurred. Al Behrman/AP hide caption

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The controversies facing his administration could be creating a stiff headwind for President Obama's second-term agenda. Jack Plunkett/AP hide caption

itoggle caption Jack Plunkett/AP

An Internal Revenue Service official apologized for workers who targeted certain conservative groups. But that did little to defuse the situation. Susan Walsh/AP hide caption

itoggle caption Susan Walsh/AP