Former US security official wants China to be forthcoming about Covid-19 origin

Jamie Metzl, a former NSC official in the Clinton administration and a member of a WHO advisory committee on genetic engineering, is one of more than two dozen experts that signed an open letter this month calling for a new international inquiry on the origin of Covid-19. They say the WHO team that visited in January was not given full unrestricted access. Metzl joined the BBC to discuss.