The truth is that, assembled in the U.S. or not, the iPhone is a truly international device that is full of components manufactured all over the world and materials mined from dozens of different countries. Apple has what is among the most complex supply chains that has ever been designed in human history, and it is not going to be able to completely change that supply chain anytime soon.
This administration uses pure BS to justify destroying the US. It’s a lot like their mode of governing during election denialism at the end of Trump I.