Multiple states bordering Canada could feel the greatest impact of a 35 percent tariff on Canadian products starting August 1.

Major stock indexes were slightly lower on Friday as U.S. President Donald Trump's announcement of tariffs on imports from Canada fanned worries about trade tensions, with the Canadian dollar down against the greenback.

U.S. President Donald Trump's threat of a 50% tariff on copper imports is raising alarm in the U.S. auto sector, as it could make it even harder for carmakers and suppliers to absorb border taxes and rising costs,

Copper entering the US from other countries is set to face a new tax of 50%, President Donald Trump has said. The decision carries through on tariff threats the president made earlier this year, when he ordered an investigation into how imports of the metal were affecting national security.

US President Donald Trump’s promised 50% copper tariffs are set to include all refined metal, indicating the president’s far-reaching efforts to bolster American production of one of the world’s most ubiquitous materials.