He renounced his US citizenship a couple of years ago, and to regain it would have to start over as a new immigrant. Whether that would count as "natural born" or not is undefined. Or he could get himself an American girlfriend and leverage the spousal rules like certain first ladies.

Also, note that those 18th Century commas are what allow us to shoot each other at will. "A well-regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed." Very clear innit.