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 Trump on Tuesday directed his Commerce secretary to investigate the need for possible tariffs on copper, the latest industry to potentially be targeted by Trump’s sweeping trade agenda.

President Trump on Tuesday signed an executive order opening an investigation into whether foreign production and imports of copper threatens America’s economic and national security.

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,