As I understand it: The long term vision is that by increasing the cost of imported goods, domestic goods will have an easier time being competitive. The short term vision is that tariffs can be used to bully other countries into doing things the U.S. wants.
There's lots and lots and lots of examples of tariffs flopping tho. They have their place for sure I'd say but typically you end up with crappier products for a higher price. And that's not even counting corollary effects like reciprocal tariffs or straining international relationships (which, surprise surprise, we've already seen both of and we haven't even really started yet lol)
Tariffs are a great way to get businesses to bribe Trump. Trump has that sweet immunity for official acts. Might as well use it by getting bribed to open up exemptions to bribing companies.
He's been sniffing around in tariffs' dressing room since the 80s when Japan was economically dominating. Rumour is he'd rather date a 25% tarrif on steel than date his own daughter, so that should tell you a lot. He also has a Navarro body pillow.