While the president has threatened to ratchet up duties against both in recent weeks, he has yet to take direct aim at them.

U.S. President Donald Trump said on Thursday that larger tariffs could be placed on the European Union and Canada if they both work together "to do economic harm to the USA."

European automakers, already struggling with tepid economic growth at home and rising competition from China, on Thursday decried the U.S. import tax on cars as a heavy burden that will punish