The American Constitution says that Presidents can’t accept gifts from any foreign source, and that has been interpreted in the past as a general prohibition on Presidents operating in any capacity in any private enterprise. Jimmy Carter put his peanut farm in a blind trust.

Not only was Donald Trump allowed to circumvent this during his first term, retaining ownership of his businesses and nominally putting his kids in charge while they pursued foreign deals, but today Trump is waist deep in Crypto, and owns a majority share of a publicly traded company whose ticker is his initials. Foreigners can (and likely do) shovel money into both. Do you think anyone will ask him to divest, like the Constitution requires him to?

The Constitution is useless unless it is enforced. It relies on checks and balances between competing branches, and right now they are broken. The only checks on Presidential power are the military (whose oath is to yhe Constitution, not to any one President) and the individual states (who retain all powers not explicitly given to the Federal government).