WASHINGTON -- The Trump administration plans to reimpose tariffs on some Canadian aluminum imports, hitting a crucial trade partner just weeks after the president’s landmark North American trade agreement went into effect. Canada threatened retaliation.

President Donald Trump announced Thursday that he’s removing Canada’s exemption from 10 percent tariffs, effective Aug. 16. The decision comes more than a month after U.S. Trade Representative Robert Lighthizer expressed concern about recent struggles by American aluminum producers, who have said they are hurting from a “surge” of metal from Canada flowing into the U.S.

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