Donald Trump says that iPhones need to be built in the US, or they'll face a 25% tariff.But it doesn't matter what Trump says: iPhones are never going to be built in the US.That's according to Patrick McGee, a journalist who just published "Apple In China: The Capture of the World's Greatest Company" — a detailed look at all of the money and effort Apple spent over decades to enmesh itself in China.McGee, who has covered Apple for the Financial Times, explains why this has been enormously helpful to Apple — because it created an ecosystem that lets it make...