A Republican member of the House Select Committee on Benghazi said Cheryl Mills, former chief of staff to Hillary Clinton, seemed to have forgotten some of the "finer details" of events surrounding the 2012 terror attack during a closed-door interview with the panel Thursday.

"She does not have a good memory," said Rep. Lynn Westmoreland, a member of the Benghazi panel that questioned Mills and Jake Sullivan, another former Clinton aide, on Fox News' "On the Record" Thursday.

"We had documents that we questioned her with, and they did seem to make her memory better," the Georgia Republican said of Mills.

Rep. Trey Gowdy, chairman of the select committee, said Thursday he planned to treat the Mills interview as "classified" and declined to discuss specifics of what was uncovered during the roughly nine-hour meeting.

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