Absolutely. Slowing sales for the iPhone, when the price can't go higher, boom. (Those tariffs won't start until after Christmas, but the only possible way out is if Trump backs down.)
How long would it take for Apple to put up factories in the US that are economical and able to deliver 100 million iPhones at the best quality and the lowest price? Think 5 years. What they're making-- or assembling-- in the states? The Mac Pro. A few thousand units. Most parts from overseas. Remember when this started? Sometime between buying Japanese TVs, because they were better and cheaper, and farming out memory chips for computers, because they were too expensive to make in the USA. Much labor required, Asian labor cheaper. When? Around the late '60s, early '70s. Jobs tried to make the Mac in automated factories, but it was a failure. Maybe it could be done now. But now, Shenzhen has everything possible for any factory to get anything electronic or digital you can. Where do we have that in the US? Nowhere. Digital industry is now worldwide. Encourage the growth of basic industries here, sure. Wait ten years, and we could have a larger percentage of "the iPhone" made in the US. Assembled, most likely, by robots. Designed in California.
This "tariffs" play is stupid and dangerous. Apple (and the stock market) are right. This is to sane policy as the WWE is to heavyweight boxing. Trump is having a pretend wrestling match with a dictator. He and his crew, none of them economists but Navarro, who's the only economist, left and right, who thinks this a good idea, and a historian who was once on CNBC, so he must know business. Guess what he was saying in 2007-8? "All this talk of recession is crazy!"