Mr. Lighthizer, a China hard-liner whom President Trump last week named to lead negotiations with Beijing, said “if we don’t get a satisfactory solution” by the end of the 90-day period, which began Dec. 1, tariffs on $200 billion of Chinese goods would rise to 25% from the current 10%. He also said the Dec.1 arrest in Canada of a senior executive at Huawei Technologies Co. at the U.S.’s request “shouldn’t really have much of an impact” on the talks. “It is totally separate from anything that I work on,” he said. “So for us it’s unrelated. It’s criminal justice.” A week after Mr. Trump and Chinese President Xi Jinping struck a trade truce in Buenos Aires, details of the cease-fire are becoming clear—big Chinese purchases, tough negotiations and shifting deadlines to finish a deal. Beijing and Washington agreed that China will purchase large amounts of goods and services, […]