A growing trade war with the United States is causing rifts within China's Communist Party, with some critics saying that an overly nationalistic Chinese stance may have hardened the US position, according to four sources close to the government. Chinese President Xi Jinping still has a firm grip on power, but an unusual surge of criticism about economic policy and how the government has handled the trade war has revealed rare cracks in the ruling Communist Party. A backlash is being felt at the highest levels of the government, possibly hitting a close aide to Xi, his ideology chief and...