Donald Trump orders new tariff investigation into US copper imports

President opens new front in assault on global trade norms as advisers claim China moving to dominate copper market

Donald Trump on Tuesday opened yet another front in his assault on global trade norms, ordering a new investigation into possible tariffs on copper imports to rebuild US production of a metal critical to electric vehicles, military hardware, semiconductors and a wide range of consumer goods.

Trump, looking to thwart what his advisers see as a move by China to dominate the global copper market, signed an order directing the commerce secretary, Howard Lutnick, to start a new national security investigation under Section 232 of the Trade Expansion Act of 1962, the same law that Trump used in his first term to impose 25% global tariffs on steel and aluminum.