Presidential candidate John McCain was born outside the U.S. to a U.S. Navy Admiral on duty at the time. His birth was acknowledged and a waver was issued. We still don't know for sure whether Obama's copy of a B.C. was legitimate
No waiver was required.
There was an investigation later, I remember reading, because there was a question about which building he was born in. Apparently, there was a hospital on US consulate land, and a clinic (if memory serves) on Panamanian land. It turns out he was born in the US one, so all was good.