Volition was going to create this title, where you play as a President with superpowers saving the world from aliens, as DLC, but they wisely realized that this was a game too precious and patriotic to be limited in such a way.
It is a game where you can truly do as you please: if you want to ride around in custom pimp cars and destroy the aliens with superior firepower, you can do that. If you want to fly around and destroy the invaders with orbital drop kicks and matrix powers, by God you can do that too. Whatever you want. You're free to do it all, because in this game you're not just American: you're Super American Gangster President.