Access to, but not final authority, at least not legally. If elon does decide to cancel social security, it still requires more than his word to make it happen legally. If congress lets it happen, that makes all of them complicit, but this one man does not have god like power to dictate all of these things. I am worried about what chaos they may create, they don't have the legal authority to do all they have threatened. If they succeed, it will be due to the complicit actions and decisions of many other officials, some elected, and some appointed.