“This Trial should not be taking place,” Trump wrote in the letter posted on Truth Social. “It is a Witch Hunt that should end IMMEDIATELY!”

U.S. President Donald Trump on Thursday announced a 35% tariff rate for goods imported from Canada, starting August 1.

Trump has broadened his trade war in recent days, setting new tariffs on a number of countries, including allies Japan and South Korea, along with a 50% tariff on copper.