Supply ships that service the offshore oil rigs on Canada's east coast load cargo in St John's, Newfoundland, Canada, February 1, 2025 after tariffs were imposed by the U.S. on Canadian exports. REUTERS/Greg Locke WASHINGTON (Reuters) - President Donald Trump has pushed into new trade law territory with an emergency sanctions law to justify punishing 25% tariffs on Canadian and Mexican imports and an extra 10% duty on Chinese goods to curb fentanyl and illegal immigration into the U.