FILE - In this May 15, 2013 file photo, House Oversight Committee 

FILE - In this May 15, 2013 file photo, House Oversight Committee Chairman Rep. Darrell Issa, R-Calif. speaks on Capitol Hill in Washington. Issa has issued a subpoena to compel the co-chairman of the independent review board that investigated last year’s attack on the U.S. diplomatic mission in Benghazi, Libya to answer questions about its findings in closed session. Issa issued the subpoena on Friday to retired veteran diplomat Thomas Pickering to force him to appear at a deposition next Thursday.  (AP Photo/Carolyn Kaster, File)
Associated Press
FILE - In this May 15, 2013 file photo, House Oversight Committee Chairman Rep. Darrell Issa, R-Calif. speaks on Capitol Hill in Washington. Issa has issued a subpoena to compel the co-chairman of the independent review board that investigated last year’s attack on the U.S. diplomatic mission in Benghazi, Libya to answer questions about its findings in closed session. Issa issued the subpoena on Friday to retired veteran diplomat Thomas Pickering to force him to appear at a deposition next Thursday. (AP Photo/Carolyn Kaster, File)
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