President Trump announced in a letter posted to social media on Saturday that he would place a 30 percent tariff on goods from the European Union, upending months of careful negotiations and further roiling what is one of the world’s most important economic relationships.

The owner of an Oaxacan restaurant in San Francisco's Mission District said he's growing increasingly concerned by rising tariffs.

US trading partners trying to navigate the final weeks of negotiations before President Donald Trump’s so-called reciprocal tariffs hit are facing a leader who has made clear he’s lost patience with talks.

The future of industrial towns like Scunthorpe and Port Talbot may rest on the wider fate of the UK's steel industry.

Mexico did not face a new tariff on April 2, the day of Trump's so-called "Liberation Day" tariff rollout. There remains a 25% tariff on non-USMCA-compliant goods from Canada and Mexico, as well as a 50% tariff on steel, aluminum and derivative products.

President Trump threatened a significant tariff hike on the European Union and Mexico, two of the largest U.S. trade partners, on Saturday. NBC News’ Yamiche Alcindor has more.

White House officials paused most of its country-specific tariffs in order to negotiate trade deals. “90 deals in 90 days,” they promised. The deadline has passed, but few deals have emerged. Now, Donald Trump is threatening to move forward with his tariffs.

President Trump is pushing through with his tariff agenda, unveiling a new batch of letters to country leaders outlining tariffs on goods imported from their countries beginning in August and a warning to BRICS nations.