From talk of acquiring Greenland and its vast mineral wealth to prodding Ukraine for minerals in exchange for help fending off Russia’s invasion, Trump has made the raw materials of modern life a pillar of his foreign policy.

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.