U.S. President Donald Trump on Saturday announced he's levying tariffs of 30 percent against the European Union and Mexico starting Aug. 1, a move that could cause massive upheaval between the United States and two of its biggest trade partners.

President Donald Trump has posted two new letters on his social media platform announcing tariffs on the European Union and Mexico.

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.

A small company in northern Mexico had faced steep competition from China in making straps, plugs, fasteners, grommets, zip ties and clamps. Now, U.S. tariffs have driven a spike in his business.

Trump and his aides have repeatedly shifted their stance on tariffs since the president’s “Liberation Day” announcement.