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,

U.S. copper prices are trading at records ahead of the 50% tariff that the president has promised to impose on imports.

Trump’s promised 50% copper tariffs are set to include all refined metal, indicating the president’s far-reaching efforts to bolster the American production of the metal Bloomberg reported. The tariff,