Donald Trump is a very stupid man. Some of his handlers are smarter (as in, they have basic competence; none of them are particularly smart) so some of the things he does have something at least resembling a coherent strategy, but sometimes Trump acts on his own and just does things for the sake of doing them.

You can still target one entity within a common market. For instance, when Canada enacted retaliatory tariffs on the United States we targeted products that were mainly produced in red states. I doubt Trump is capable of that kind of strategy, though.