Trump certainly didn’t, he thought “they’ll just start making it in USA!”
Yeah, he totally doesn't get, and can't be taught, and can't be bothered to try to comprehend, that it would take a decade to spin up a fully US manufactured iPhone. There are skillsets where the US has dozens of qualified people (working at defense contractors since their stuff
has to be made here), and China has tens of thousands of qualified people. China can support hundreds of thousands of skilled workers in the same densely packed city working on one product - the US doesn't have anything like that sort of concentration of skilled labor anywhere right now (especially as spare capacity that could start working on iPhones next month).
The proper approach, if the goal was actually US manufacturing, and the person wanting that had any shred of intelligence, would be to start a ten year plan of encouragements/benefits to train a whole crop of people in the necessary skills, along with building an "Apple City" somewhere that could support all the manufacturing necessary to churn out something in excess of
half a million phones a day, like they're doing in China. But Trump's brain is that of a 4 year old, who thinks that if they yell and stamp their feet enough, reality will bend to fill their desires. Putting on tariffs
now to force manufacturing back immediately, is jumping out of an airplane and
then starting to shop around for parachutes.
In reality, if iPhone manufacturing does end up coming back to the US, it'll likely be in the form of
highly automated factories employing a fraction of the workforce that the Chinese factories employ, mostly just overseeing/maintaining the robotic equipment that's doing all the assembly work, thus not getting the huge number of manufacturing jobs that Trump thinks this will generate.