Hi, this is Colum Murphy in Beijing, where Chinese officials are throwing a few sharp elbows in their running rivalry with the US.

Generic drugmakers and hospital pharmacists warn that added financial pressure from tariffs could strain the nation's generic drug supplies.

Trump cited the fentanyl issue as the reason for imposing a 10% tariff on all Chinese imports in early February, on top of any existing duties. He doubled that to 20% earlier this month. He also has cited fentanyl, along with other reasons, for imposing tariffs on Canada and Mexico.