President Donald Trump’s tariff strategy has been thrown into turmoil after a US court issued a rare rebuke blocking many of the import taxes he has threatened and imposed on other countries.

The U.S. Court of International Trade on Wednesday struck down tariffs imposed on virtually every country by President Donald Trump, ruling that he exceeded the authority granted to him under the 1977 International Emergency Economic Powers Act.

China’s Foreign Ministry responded to a U.S. court blocking Trump-era tariffs by warning that trade wars have no winners and protectionism harms all sides. The U.S. Court of International Trade ruled that the emergency law used didn’t grant the president authority to impose sweeping global tariffs,