I'm sure that Trump is aware of the fact that in the short term, prices will increase - that's a given. What the anti-tariff hysterics don't seem to be aware of is that supply and demand aren't static and that those upticks in price aren't permanent - i.e. global supply chains can be replaced with domestic ones, and as domestic production increases to meet the demand, those prices will rise, while in the meantime supporting domestic rather than foreign production.
Not as if what we have now is Free Trade.