President Donald Trump’s trade war with China has escalated even as other countries got a partial reprieve, threatening the relationship between U.S. manufacturers and retailers and one of America’s largest trading partners.

China on Wednesday unexpectedly appointed a new trade negotiator key in any talks to resolve the escalating tariff war with the U.S., replacing veteran trade tsar Wang Shouwen with the Chinese envoy to the World Trade Organization.

The economy grew steadily from January through March, but U.S. tariffs pose a risk for China in the coming weeks and months.