Prices of copper in the US have surged since January, when President Donald Trump threatened to impose a tariff on imports of the metal that’s a vital component in power networks, plumbing and industrial machinery.

US stocks’ record highs obscure the risks Donald Trump poses to the world’s biggest economy, according to big investors and senior bankers who have warned over growing “complacency” in the markets.

US President Donald Trump has sent letters to 23 trading partners this week, including Canada, Japan, Brazil, and others — threatening blanket import tariffs ranging from 20% to 50%. The move, part of a renewed aggressive trade stance,

In the past week, President Donald Trump has managed to make his erratic trade policies even more baffling to countries desperate to negotiate an escape from his wrath.

The U.S. dollar rose on Friday on more signs of upheaval in the global trade landscape, as U.S. President Donald Trump announced more tariffs and said he planned to impose blanket levies of 15% or 20...