A federal court has ruled against President Trump's use of the International Emergency Economic Powers Act to impose broad tariffs, sparking a legal battle that could reshape U.S. trade policy. The White House's immediate appeal prolongs uncertainty for businesses and governments affected by these tariffs.

A federal court on Wednesday blocked President Donald Trump’s efforts to issue a range of tariffs under an emergency powers statute.

Here is some background on the court that made the May 28 decision to block a far-reaching tariff policy May 28.