NPR News Now covers escalating U.S.-Canada trade tensions, with the White House banning Canadian motorcycles, dairy, and alcohol in retaliation for Canadian tariffs. The report also details the New Hampshire Senate race call, ongoing military clashes between the U.S. and Iran, and the mistrial in the Lindsay Clancy case. Additionally, the episode highlights a new Republican midterm convention in Dallas, recent PISA international student assessment results, and South Park’s satirical name change to "South America."