President Donald Trump said Thursday the U.S. will impose 10% tariffs on $300 billion of Chinese goods beginning Sept. 1. In a tweet, the president said trade talks with Beijing are continuing after U.S. officials returned from negotiations in China. The 10% levies will apply to $300 billion of Chinese goods coming into the U.S. It doesn't include $250 billion of goods already subject to tariffs, the president said. U.S. stocks DJIA, +1.33% turned mostly negative after Trump's announcement.