President Donald Trump’s trade war faces a crucial test as a federal appeals court hears a challenge to his use of emergency powers to impose sweeping tariffs on imports.

A U.S. appeals court on Thursday will review President Donald Trump's power to impose tariffs, after a lower court said he exceeded his authority with sweeping levies on imported goods.

Companies, consumers and foreign countries have been paying close attention to President Donald Trump’s aggressive policy of placing tariffs on foreign goods. Soon, the courts will weigh in on whether Trump has the power to levy those tariffs in the first place — a high-stakes legal battle that will either affirm a key pillar of Trump’s economic policy or cut it off at the knees.