In Europe the common EU legislators would certainly look very closely on any car dealership monopoly and probably rule against it. I feel certain that Donald Trump too is against this kind of monopoly as you see it in f.in TX and MI. Especially as it is disadvantagous to a company with a US workforce (Tesla).
But being unfamiliar with the US state legislation I'm unsure if he will be able to do something about it ?
But being unfamiliar with the US state legislation I'm unsure if he will be able to do something about it ?