In recent years, since a lot of central banks have been putting gold and other assets instead of US dollars on their balance sheet, the dollar need new outlets and this is what those stablecoins through Circle and Tether are: easy access to dollars for anybody with a computer and internet connection, skipping banks and other financial institutions.
Trump is a pro crypto president in the sense that he is making it official and a lot of actors in finance are fighting it because it is killing their own lucrative scam.
The whole Trump memecoin and World Liberty Financial is shady but really a side story.
The bottom line is if you hold USD a lot of "legacy" actors are making money on your back. With stablecoins Tether, Circle & co join the party.