President Donald Trump concedes that some Apple Inc. products may become more expensive if his administration imposes “massive” additional tariffs on Chinese-made goods, but he says the tech company can fix the problem by moving production to the U.S. “Start building new plants now. Exciting!” Trump said Saturday in a tweet aimed at the Cupertino, California-based company. This week, Apple said that a proposed new round of $200 billion in additional tariffs on Chinese imports would raise prices on some of its products, including the Apple Watch and the Mac mini. The company is highly exposed to a trade war between the U.S.