Most of the tariffs that U.S. President Donald Trump has imposed on countries around the world — including the ones on Canada that he's threating to bump to 35 per cent — face a crucial legal test on Thursday.

President Donald Trump has been getting his way on trade, strong-arming the European Union, Japan and other partners to accept once unthinkably high taxes on their exports to the United States. But his radical overhaul of American trade policy,

Back in May, the U.S. Court of International Trade ruled that Trump overstepped his bounds by using IEEPA to apply tariffs. Just a day later, the decision was paused and tariffs were back on. The lawsuit was brought by a wine importer called V.O.S. Selections and four other small businesses. Analysts expect the case to reach the Supreme Court.