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.

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

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.

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

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.

Plus, the Justice Department has subpoenaed 20 doctors and clinics involved in “performing transgender medical procedures on children.”

Nissan has suspended U.S. production of three vehicle models destined for Canada as mutual tariffs between the U.S. and Canada disrupt cross-border auto trade.