Musk not, but the US government actually has powerful levers at its hand to force his cooperation if necessary. If all things fail, arrest him and nationalize his assets. It's not the first time someone who thought themselves to be above the law got eventually rear-ended by it - remember Al Capone, they got him on tax evasion in the end.

There are only three known entities to have bested the US government in many decades - Vietnam, Scientology and the Taliban. Musk is better advised that it's a foolish attempt to become the fourth one.