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

President Trump wants America to produce more of the much-needed mineral, but a 50 percent tariff could undermine his aim of a manufacturing renaissance.

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.

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.

Trump said on Tuesday that he would impose a 50% tariff on copper. Though the remarks were light on specifics, his comments sent the metal to all-time highs.

U.S. President Donald Trump's 50% tariff on copper has placed a record premium on prices of the metal in the United States that is likely to ease over the coming months as a stockpile created by traders anticipating the levy works through the system.