May 20 2019, 9:00 AMMay 20 2019, 10:00 AMMay 20 2019, 9:00 AMMay 20 2019, 10:00 AM (Bloomberg Opinion) -- U.S. President Donald Trump under-estimated China President Xi Jinping’s resolve when he raised tariffs on about $200 billion of imports from China to 25 percent from 10 percent, warning his counterpart not to respond in kind. That advice was ignored.