Probably because there is none. The “rebels” did it.
Not only did the “rebels” do it, they were supplied the weapons from the CIA in Benghazi.
These surgical strikes that he keeps promoting are designed to eliminate all the evidence that could hurt Hillary. Notice Bill is out promoting Obama again? He doesn’t do anything for Obama unless there is a trade off.
We have been supplying the Muslim Brotherhood (and by proxy Al Queda) for the past 5 years.
Now the evidence must be destroyed.