The House Benghazi committee has issued a subpoena to a senior Pentagon official who criticized the GOP-led panel for making costly and unnecessary requests to the Defense Department.

Stephen Hedger, an assistant secretary of defense, will be interviewed under oath next week. Hedger claimed in a letter to the committee that officials could not find one of the requested witnesses — a drone sensor operator who identified himself on talk radio as “John from Iowa” — despite expending “significant resources” to do so.

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