The world’s top commodity traders are rushing to ship copper to the US from as far afield as Asia as Donald Trump’s threat of import tariffs on the metal creates a huge opportunity for profit.

Tariffs, if they are imposed, could boost U.S. production of a valuable resource but also raise costs for automakers, construction companies and others.

President Donald Trump opened yet another front on Tuesday in his assault on global trade norms, ordering a probe into potential new tariffs on copper imports to rebuild U.S. production of a metal critical to electric vehicles,