The cover up was the attempt by all official spokespeople to hide the fact that this was a secret CIA facility.
That statement is incorrect. The cover-up was to hide policy/administration failure before an election. No sense debating the rest of that as it's just expanding on a false premise.
Actually, his is close to my point of the OP.
My point is that this Admin. LIED on purpose about the event.
From the get go it was a terrorist attack on our embassy, our embassador was killed.
Then they lied their butt about it again, and again, and again.
Then, he changed his story a bit, after he and his staffed LIED.
Spin that any way want.