President Barack Obama walks away from the podium after speaking on the Internal Revenue Service's targeting of conservative groups for extra tax scrutiny in the East Room of the White House in Washington, Wednesday May 15, 2013. Obama announced the resignation of Acting IRS Commissioner Steven Miller, the top official at the IRS. (AP Photo/Pablo Martinez Monsivais)

Associated Press
President Barack Obama walks away from the podium after speaking on the Internal Revenue Service's targeting of conservative groups for extra tax scrutiny in the East Room of the White House in Washington, Wednesday May 15, 2013. Obama announced the resignation of Acting IRS Commissioner Steven Miller, the top official at the IRS. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama walks away from the podium after speaking on the Internal Revenue Service's targeting of conservative groups for extra tax scrutiny in the East Room of the White House in Washington, Wednesday May 15, 2013. Obama announced the resignation of Acting IRS Commissioner Steven Miller, the top official at the IRS. (AP Photo/Pablo Martinez Monsivais)