President Trump warns Canadian Prime Minister Mark Carney of a new 35% tariff on Canadian imports if the country doesn't address fentanyl trafficking and existing trade disputes.

Although markets are trying to shrug off the week's U.S. tariff threats as yet another negotiation tactic, there's growing unease at the daily barrage, the latest being a 35% tariff on Canadian goods and higher levies on other countries.

Marco Rubio meets with Russian foreign minister amid tensions over Ukraine and Trump releases tariff letters to trading partners.

U.S. President Donald Trump said on Thursday the United States would impose a 35% tariff on imports from Canada next month and planned to impose blanket tariffs of 15% or 20% on most other trading partners.

The U.S. has sanctioned Myanmar's military junta and refused to acknowledge its rule, so Mr. Trump's personal letter to its leader was welcomed, despite the subject.

This week, the president began sending letters to U.S. trade partners outlining what their proposed tariff rates will be.

President Donald Trump's administration says higher rates will go into effect Aug. 1. Here's where trade negotiations stand.