Vietnam is in a state of mourning today with flags at half-mast. The ruling Communist Party is holding a funeral for Nguyen Phu Trong, the country’s leader until he died last week at 80 years old. Foreign diplomats are in the capital Hanoi — including US Secretary of State Antony Blinken — both to pay respects and also to secure some face time with Vietnam’s new leader, To Lam, a man known for ruthlessly neutralizing his rivals. The World’s Patrick Winn reports.