The night the consolate was attacked, they sent a call for help. The US military started to respond. They didn't have troops close enough to send a rescue party quickly enough, but they did have aircraft. The aircraft were sent.
Before the aircraft could arrive, Barack Obama ordered them to return to base. Two general officers,Gen Carter Ham and Rear Admiral Charles M. Gaouette, refused to abandon Americans to Al Quada. Obama fired both of them that night. For good measure, he fired two more the next day.
And that's why Obama has been stonewalling the Benghasi affair ever since.