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. 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," [Committee Chairman Devin] Nunes said at a hearing Thursday. 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. There is already an ongoing Defense Department Inspector General investigation into allegations that intelligence analysts at CENTCOM were pressured into changing their analysis to make their reports sound overly optimistic. Congress is conducting a separate investigation. The committee has information from whistleblowers that both intelligence files and emails were deliberately deleted at Central Command, but that copies remain in the hands of analysts. Some Pentagon officials have privately told CNN they believe the problem at Central Command is that some analysts feel their work is not accepted if it shows a negative view of progress.