CNBC's Steve Sedgewick, Karen Tso and Julianna Tatelbaum discuss the copper market after U.S. President Donald Trump says he will impose a 50% tariff on imports, sending U.S. prices of the metal jumping.

🤦🏼♀️ Good god, Trump is actively trying to destroy whole industries on his way out the door. Forget the defense industry, this decimates the construction industry. Between his tariffs on lumber, steel, and COVID his first term — how many times can he screw over builders his second… https://t.co/9HFPYELoVj

U.S. President Donald Trump on Tuesday said he would impose a 50% tariff on imported copper and soon introduce long-threatened levies on semiconductors and pharmaceuticals, broadening his trade war that has rattled markets worldwide.

President Donald Trump's threats to impose high tariffs on countries make U.S. trading partners and investors nervous. But his sector tariffs could hurt consumers and businesses more in the long run.