Marine Col. George Bristol is a key witness in the Benghazi attack investigation by Congress. On Friday, the Defense Department has now stated they will allow members of Congress to speak with Col Bristol, who was in command of the U.S. Special Forces in Northern Africa (AFRICOMM) on September 11, 2012. Officials had previously told Congress that he was retired and couldn’t be found and so could not be made available. Now they are claiming that was an “administrative error.” U.S. Rep. Jason Chaffetz (R-UT) and Sen. Lindsey Graham (R-SC) were among those who have never accepted that excuse.

Rep. Chaffetz said that the DoD had been unwilling to “pass along any sort of information about Col Bristol’s location.

Air Force Maj. Robert Firman confirmed to the Daily Mail, “The Department of Defense has fully cooperated with congressional requests to understand the attacks on the Benghazi compound,’ Firman said. ‘Col. George Bristol, USMC, will be available to meet with House and Senate members and their staffs.”

Senator Graham sent a letter to Defense Secretary Chuck Hagel on Thursday citing Bristol’s “in-depth knowledge of the region, coupled with his close interaction with U.S. Special Operations Forces operating on the African continent.”

Graham wrote that Bristol “would be the ideal person to speak with about what happened on the ground in Benghazi.”