New Delhi, Oct. 21 -- A major US food importer has filed a lawsuit challenging President Donald Trump's 50% tariffs on certain Canadian products, arguing that the administration lacked the legal authority to impose the duties under a little-known provision of a 1930 trade law.

Gellert Global Group filed the lawsuit on Tuesday, asking the US Court of International Trade to declare the tariffs unlawful and stop their enforcement and collection. The company has also sought refunds with interest for duties it claims were unlawfully collected.

The legal challenge comes after trade negotiations broke down earlier this year between Washington and Ottawa, prompting the US to impose tariffs on billions of dollars' worth of Canadian goods and tri...