FILE – In this April 9, 2013, file photo Sen. Carl Levin, D-Mich., left, talks with Sen. John McCain, R-Ariz., on Capitol Hill in Washington. A Senate investigative panel led by Levin and McCain has been reviewing the use of the social welfare groups for political causes for the past year. The lawmakers had planned a hearing on the subject but postponed it following the Internal Revenue Service disclosure, so it could examine the agency's handling of the tax-exempt reviews. The IRS has endured withering criticism for its scrutiny of conservative political groups during the 2012 elections. (AP Photo/J. Scott Applewhite, File)

Associated Press
FILE – In this April 9, 2013, file photo Sen. Carl Levin, D-Mich., left, talks with Sen. John McCain, R-Ariz., on Capitol Hill in Washington. A Senate investigative panel led by Levin and McCain has been reviewing the use of the social welfare groups for political causes for the past year. The lawmakers had planned a hearing on the subject but postponed it following the Internal Revenue Service disclosure, so it could examine the agency's handling of the tax-exempt reviews. The IRS has endured withering criticism for its scrutiny of conservative political groups during the 2012 elections. (AP Photo/J. Scott Applewhite, File)
FILE – In this April 9, 2013, file photo Sen. Carl Levin, D-Mich., left, talks with Sen. John McCain, R-Ariz., on Capitol Hill in Washington. A Senate investigative panel led by Levin and McCain has been reviewing the use of the social welfare groups for political causes for the past year. The lawmakers had planned a hearing on the subject but postponed it following the Internal Revenue Service disclosure, so it could examine the agency's handling of the tax-exempt reviews. The IRS has endured withering criticism for its scrutiny of conservative political groups during the 2012 elections. (AP Photo/J. Scott Applewhite, File)
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