That could take more than 4 yrs for that to happen if ever considering companies first would have to start from scratch to build, stock and staff these plants- additional costs which will be paid by the consumer.
Govt's largest source of revenue comes from taxation (theft). Tariffs would have to be exponentially higher than these lil 10-25% numbers being thrown around. We haven't even broached the topic of the national debt or how much money he plans on taking OUT of circulation.