Darrell Issa

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FILE - In this Feb. 5, 2014 file photo, Rep. Darrell Issa, R-Calif. listens during a hearing on Capitol Hill in Washington. House Republicans have blocked an attempt by Democrats to chastise Issa for his conduct at a committee hearing. Issa abruptly adjourned a hearing of the House Oversight Committee Wednesday. He instructed committee staff to turn off the microphone of the committee's top Democrat, congressman Elijah Cummings of Maryland. The hearing was on the improper targeting of tea party groups by the Internal Revenue Service. Cummings was trying to say that Republicans have overblown the controversy. (AP Photo/Lauren Victoria Burke, File)

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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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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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Rep. Darrell Issa, California Republican, says the FDA's surveillance mirrored the book, "1984." (Associated Press)

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FILE - In this Feb. 5, 2014 file photo, Rep. Darrell Issa, R-Calif. listens during on Capitol Hill in Washington. As the Obama administration raced to meet its self-imposed deadline for online health insurance markets, security experts working for the government worried that state computer systems could become a back door for hackers. "The administration has not been forthcoming with the American people about the serious security risks," Issa said in a statement. "Despite repeated assurances from HHS, the department appears to still be struggling with security concerns." (AP Photo/Lauren Victoria Burke, File)

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FILE - In this Feb. 5, 2014 file photo, Rep. Darrell Issa, R-Calif. listens during on Capitol Hill in Washington. As the Obama administration raced to meet its self-imposed deadline for online health insurance markets, security experts working for the government worried that state computer systems could become a back door for hackers. "The administration has not been forthcoming with the American people about the serious security risks," Issa said in a statement. "Despite repeated assurances from HHS, the department appears to still be struggling with security concerns." (AP Photo/Lauren Victoria Burke, File)

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House Oversight and Government Reform Committee Chairman Rep. Darrell Issa, R-Calif., right, talks with Albert Douglas, a Selectman from Pittsfield, N.H. Monday, Feb. 17, 2014, at the Concord City and Merrimack County Republican Committee Lincoln-Reagan Day Dinner in Concord, N.H. Issa, who is spearheading investigations of President Barack Obama's administration by the GOP-run House urged his party Tuesday to unite against Obama's "imperial presidency". (AP Photo/Jim Cole)

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House Oversight Committee Chairman Rep. Darrell Issa, R-Calif., arrives for a hearing on Capitol Hill in Washington, Thursday, Jan. 16, 2014, investigating the chaotic rollout of the HealthCare.gov website. (AP Photo/J. Scott Applewhite)