Internal Revenue Service

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**FILE** Former IRS official Lois Lerner speaks on Capitol Hill in Washington on March 5, 2014, during the House Oversight and Government Reform Committee hearing on the the agency's targeting of tea party groups, where she invoked her constitutional right not to incriminate herself. (Associated Press)

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House Oversight and Government Reform Committee Chairman Rep. Darrell Issa, R-Calif., right, leaves as the committee's ranking member Rep. Elijah Cummings, D-Md., left, begins his statement on Capitol Hill in Washington, Wednesday, March 5, 2014, during the committee's hearing where former Internal Revenue Service (IRS) official Lois Lerner invoked her constitutional right not to incriminate herself. (AP Photo/Lauren Victoria Burke)

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The attorney for former Internal Revenue Service official Lois Lerner says his client will continue to assert her rights not to testify about the IRS targeting of conservative groups. (Associated Press)

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House Oversight Committee Chairman Rep. Darrell Issa, California Republican, said on "Fox News Sunday that former Internal Revenue Service official Lois Lerner's lawyer told him she would testify on Wednesday about the IRS targeting of conservative groups.

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Ousted IRS chief Steve Miller, right, and J. Russell George, Treasury Inspector General for Tax Administration, are sworn in on Capitol Hill, in Washington, Friday, May 17, 2013, prior to testifying before the House Ways and Means Committee hearing on the Internal Revenue Service (IRS) practice of targeting applicants for tax-exempt status based on political leanings. (AP Photo/Charles Dharapak)

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Internal Revenue Service (IRS( Commissioner John Koskinen arrives on Capitol Hill in Washington, Wednesday, Feb. 5, 2014, to testify before the House Ways and Means Oversight Subcommittee hearing on the IRS. (AP Photo/J. Scott Applewhite)