President Donald Trump is waging a trade war without getting approval from Congress: He declared a national emergency to slap import taxes — tariffs — on almost every country on earth.

A group of small businesses urged the US trade court to block President Donald Trump’s “Liberation Day” global tariffs during a court hearing that could have a major impact on the Republican’s economic agenda.

The case heard Tuesday is one of several filed against the Trump administration seeking to block tariffs the president implemented last month. The first lawsuit was filed in the U.S. District Court for the Northern District of Florida against Trump’s tariffs on China, which were imposed earlier this year.