U.S. Trade Representative Ambassador Katherine Tai will testify this week before two congressional committees after her surprise announcement last week that the administration backs waiving coronavirus vaccine patents protections. Tai will testify Wednesday (May 12) on the president’s trade policy agenda before the Senate Finance Committee and again the next day before the House Ways & Means Committee. Tai’s announcement set off celebrations and protests and a lot of talk about whether it matters. It also had a dizzying effect...