Exactly the two American car manufacturers are able to survive rather well so far with pretty much no sales abroad. They are still some of the largest in the world. That is besides the US being a large enough market for companies to seriously consider keeping their combustion engine technology around, if they believe it will sell. This obviously means they might lobby their home markets to keep them around as well. Stellantis is the most obvious company to maybe do that.

Bidens action turns 10% of global car sales electric(not counting other countries actions here) and forces GM and Ford to go electric.