Republicans on the House Select Committee on Benghazi announced Friday they have issued a subpoena for a Pentagon official who claimed in late April that he was unable to locate a witness who had been an active-duty member of the Air Force all along.

Rep. Trey Gowdy, R-S.C., who chairs the committee, said the subpoena would force the Pentagon official to explain whether the long delay in gaining access to the witness was an attempt by the military to cover up his testimony.