It increases costs for all consumers (aka inflation), makes American manufacturers and their products less competitive and hurts the overall economy.
Bottom line: Tariffs ultimately hurt as much as they help --- if not more. Only a simpleton would think this sort of juvenile policy applied on a large scale is how you "Make America Great Again".
I can see both sides. If we keep using slaves to produce materials that lessen our dependence non-renewables and help save us from a climate disaster, then maybe it's a question of perfect being the enemy of the good?
On the other hand if we continue to rely on slave labor to get us these resources, then will we remain dependent on slave labor? Will we be endorsing slave labor, and by doing so help expand its use around the world?
Or maybe, given our current record with slave labor in the U.S. [1] is this all just hand waving anyway? IOW if we use slaves, why should we complain if our economic partners do?
[1] https://www.aclu.org/news/human-rights/captive-labor-exploit...
Are you speaking out of specific knowledge about this subject or out of generalized prejudices?
Remember, the race to the bottom does have an adjustable lower bar.