If you believe in these tariffs then the major problem is how he enacted them. Businesses want certainty. It takes years to build factories. The next president could just wipe away these tariffs instantly. Hell, even the current one could. That does not give these companies the certainty they need to commit years of effort to building factories. If the goal is to spur domestic manufacturing then, at a minimum, he would get the tariffs enacted via a new law so they're more likely to stick for the long term.