This will greatly affect all the Tesla competitors like GM and Ford as their margins are negatively thin. Tesla is not as affected as compared to the rest as majority of their parts are created inhouse. This will caused tremendous amount of headwinds for their competitors and it will not be sustainable for them in the long run. It would seems like a double-edge sword but never bet against Elon + Trump relationship.
Musk Says Impact of Auto Tariffs on Tesla Is "Significant"