Trump invoked Section 338 of the Tariff Act of 1930 to slap a 50% tax on $20 billion worth of Canadian imports.

In firing up a trade war with Canada, President Donald Trump turned to a 96-year-old statute so obscure that many trade lawyers didn’t even know it was still on the books.

WASHINGTON (AP) — In firing up a trade war with Canada, President Donald Trump turned to a 96-year-old statute so obscure that many trade lawyers didn’t even know it was