President Donald Trump is taking a step toward granting the U.S. mining industry’s biggest wishes by singling out one metal as a focus of his domestic minerals policy: copper. From talk of acquiring Greenland and its vast mineral wealth to prodding Ukraine for minerals in exchange for help fending off Russia's invasion,

An executive order mandates a review of the threats posed by over-reliance on foreign copper, and recommendations for increasing domestic supply.

WASHINGTON (Reuters) - U.S. President Donald Trump on Tuesday opened yet another front in his assault on global trade norms, ordering a new probe into possible new tariffs on copper imports to rebuild U.S. production of a metal critical to electric vehicles, military hardware, semiconductors and a wide range of consumer goods.