Perhaps a tariff would be convinced them to to build their NEXT factory in the USA. Or it could cause another manufacturer to build here.
Not likely, but it might cause them not to build it AT ALL. This is what taxes and regulations do destroy business opportunity. Think Boeing: they moved a plant to SC to escape Seattle's liberalism - because there is much less in SC. Had the unions won in SC, the next stop would have been .overseas or not at all. And with Boeing and Apple, they sell their products worldwide, so a tariff in the US would only deprive US customers .not the company per se necessarily.
What would cause them to build it here is a roll back of regulations and bureaucracy and taxation here. It is very expensive to build stuff overseas and ship it back here. Companies only do it when it's even more expensive to put up with our unions, our EPA, our IRS, our OSHA, etc etc etc.
Apple manufactures their products in China because they get most of their components from Asia, and because they sell most of their products in Asia, too.
That last item is something Americans may never get used to. We always like to think of ourselves as richest country in the world, but as consumer products become more affordable the value of 300+ million customers in the U.S. starts to diminish compared to a billion customers in China and another billion in India.