MSNBC's Lawrence O'Donnell and Jen Psaki discuss the breaking news that Donald Trump is now threatening Canada with tariffs of 35% claiming the "flow of fentanyl" from America's northern neighbor as his reason.

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.

President Donald Trump announced a new set of duties on Canadian goods that were not covered by existing sectoral tariffs.

Canada would bear the brunt of Trump's tariffs in terms of economic contraction, says The Budget Lab of Yale.

Major stock indexes were slightly lower on Friday as U.S. President Donald Trump's announcement of tariffs on imports from Canada fanned worries about trade tensions, with the Canadian dollar down against the greenback.

US stocks mostly fell on Friday after President Trump threatened Canada with a 35% tariff on its imports to the US and floated higher blanket levies on most trading partners. The

On Thursday, the president announced a 35 percent tariff on all Canadian goods not covered by the United States-Mexico-Canada Agreement (USMCA) to take effect on August 1, unless a trade deal is reached before then.

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.