With sweeping auto levies, the president is putting his beliefs about tariffs into practice on the global economy. Economists aren’t optimistic.

President Donald Trump warns of escalating trade war against Canada and European Union nations if the countries unite against U.S. economic interests

Trump has so far targeted nations with persistent trade imbalances with the U.S., including China, Canada and Mexico, as well as the European Union. More countries will soon be brought into his trade wars with the unveiling of reciprocal tariffs expected to hit a wider swath of nations in early April.