There is no way it could be statehood, it'd put another California-sized electoral voting block on the table. Despite claims of "51st state", it'd be annexed into a territory. If he wants another star on the flag he's going to want a much less populus group of freshly furious voters.
As someone from the US, I love this idea... But maybe you should go with territory instead. It's questionable at best if the US can handle having its own government.