Christmas, and a lot else, will be more expensive this year for American consumers as Donald Trump’s trade wars upend global supply chains.

“This is much worse than the first trade war,” said Zheng Tao, an export trader of car parts. “My biggest concern is the ...

“There’s no longer a commercial decision that can fix it,” said Zheng Tao, a Shanghai-based exporter of car parts. “We’ll just have to see how the politicians handle this.” His worries ...