That's one of those industries you probably want to keep a domestic presence in, for strategic reasons. Chip fab might be another. But I'd do it via subsidy, not tariff, otherwise you're adding friction to everything downstream of it.

I always thought that was why so much money went into the military. Requiring a domestic source for military equipment provides a neat way for local suppliers to sell their goods above fair market value. The government gets to give a subsidy without actually doing all the paperwork involved in giving subsidies, and very few people are going to argue with an "it's for national security" argument.