As President Donald Trump threatens new tariffs on Mexican goods, retaliatory ones between China and America are starting to bite. That puts China’s party leaders—and their hardening nationalist message—in a tricky spot. We examine how the global grounding of Boeing’s 737 MAX planes might change air-safety regulation. And a visit to Venice’s Biennale, where immigration and climate change are taking centre stage. For information regarding your data privacy, visit acast.com/privacy