> we don’t have the know how, labor to do it to begin with.

That, I believe, is one of the reasons why the H-series and E-series exist in the United States, along with the L visa. It gives you the opportunity to bring foreigners into the United States, either for a limited (but finitely-extendable) period of time, or permanently.

You can argue that the current forms of those visas do not work, but that is not my point: My point is that the above reason is why the visas exist.

To bring my point back around to tariffs: I think making the above-mentioned visas harder to get goes against the purpose of the tariffs. If you want manufacturing etc. brought back here, then make it easy (or easier) to get the knowledgeable folks who you need to train the folks who will do the manufacturing here.