We couldn't make an iPhone because apple would refuse to cooperate, not because of a technical limitation. We could make a similarly capable phone though.
Apple’s putative refusal to cooperate is surely not the only barrier here. I doubt U.S. consumers would pay a premium for a U.S. iPhone whether Apple thought it wise or not. But when the U.S. president’s branded Made in America phone comes out later this year I guess we’ll see. I’m sure the release is just around the corner.
If the tariffs are high enough there won't be a premium. It also solves the deficit spending problem which needs to happen since no one seems to be able to handle the idea of any spending cuts.
Not just that, the raft of features that may have to be disabled until that performance and performance per watt gets back to where it is today.