I’m out of the loop, so what’s the big deal with this? What kind of promise does that break?

If he wants to keep American companies in American hands, isn’t this exactly the kind of thing he should be doing? Still probably not the smartest thing to do but, isn’t this kind of period of isolationism exactly what he has promised.

On the other hand, I recall hearing something about him protecting American jobs, but these two goals are in conflict here. Either you fund your industry yourself or accept foreign investments. If the former isn’t possible, then the latter remains the obvious choice.