Story highlights Committee Chairman Devin Nunes of California blasted the Pentagon

There is already an ongoing Defense Department Inspector General investigation

Washington (CNN) The Republican-led House intelligence committee wants the Pentagon to provide what it believes are illegally deleted intelligence files pertaining to the U.S. military campaign against ISIS in Syria and Iraq.

Committee Chairman Devin Nunes of California blasted the Pentagon, citing the allegations that classified intelligence files and emails about the war on ISIS were deleted.

"We have been made aware that both files and emails have been deleted by personnel at CENTCOM, and we expect that the Department of Defense will provide these and all other relevant documents to the committee," Nunes said at a hearing Thursday on worldwide threats.

The U.S. Central Command based in Tampa, Florida, oversees the war against ISIS and all U.S. military operations in the Middle East.

Nunes' assertions led to an extraordinary public acknowledgment from Lt. Gen. Vincent Stewart, director of the Defense Intelligence Agency, who was testifying before the committee, of the "unusually high" dissatisfaction inside the agency responsible for providing military intelligence on ISIS.

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