Gingrich alleged that there were emails from the office of the National Security Director in the WH denying military assets to the CIA agents who requested them. At the time, the agents were engaged in a fire fight with the Islamist militias in Benghazi, and were later killed by mortar fire. The email referenced here is discussing the security situation in Benghazi several months before the attack took place.
Actually, it says it was sent in August.