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

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,

President Trump's move to impose a 50% tariff on U.S. copper imports targets a vital metal that is widely used in many products and industries. That could lead to higher prices for everything from appliances and electronics to cars and home repairs,

"America will, once again, build a DOMINANT Copper Industry," Trump said in a post on his Truth Social media platform.

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 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.

In the letters, President Trump warned countries that they would face even higher tariffs if they retaliated by increasing their own import taxes.