You use tariffs to equalize actual costs plus a little (environmental/climate rules, labor costs, regulatory environment, human rights, etc) between the US and a foreign country. It doesn't have to be a huge amount of increase either, 5-12% - and probably wouldn't apply to most developed countries, because it is based on that matrix of total cost of doing business.
As far as rationale here - I personally want to onshore as much production as I can - but you can't start with finished goods necessarily, you often have to start with the base supportive industries needed - but even I acknowledge that may not be practical for everything.
But, to do what I want to do is a decades long process and must be done strategically and carefully - blanket tariffs dont do that, and are just a blowtorch to the delicate interconnections of a modern economy. Like targeting agricultural goods is absurd, for example - and will just raise prices for no tangible good.