The president has published just 22 letters, many to minor trading partners like Brunei, Moldova and Sri Lanka.

U.S. President Donald Trump's plans to impose 50% tariffs on copper would include semi-finished products such as those used for power grids, the military and data centers, Bloomberg News reported on Thursday,

President Trump will wield 50% copper tariffs on August 1 as he promises more to come with countries such as Brazil in the crosshairs. Delta’s good news, Nvidia scores the first $4 trillion market cap milestone,

Copper futures (HG1:COM) extended their rally on Thursday, rising around 2% as traders reacted to U.S. President Donald Trump’s announcement of a 50% tariff on imported copper, set to take effect on August 1.

Global copper traders are offering cargoes to Chinese buyers as they look to offload metal no longer able to reach the U.S. before President Donald Trump's 50% copper tariff deadline.Trump said late on Wednesday he would impose the new tariff from August 1 to promote domestic production of everything from semiconductors to ammunition.

U.S. President Donald Trump's announcement of a proposed 50% tariff on copper imports has raised concerns in Chile and Peru, which together account for nearly 40% of global copper production.

President Trump is threatening new 50% tariffs on copper and up to 200% on pharmaceutical imports. He also announced new tariffs on six countries. NBC News' Vaughn Hillyard reports the latest. Veda Partners Managing Partner Henrietta Treyz and University of Michigan Professor of Economics and Public Policy Justin Wolfers join Katy Tur to break down the economic impact of Trump's policies on Americans.

Brazilian President Luiz Inacio Lula da Silva responded to Trump's letter by issuing a statement saying that any unilateral measure to increase tariffs would be met with a response in accordance with Brazilian law.