There's a debate in public health about whether vaccine policy should target American children, or adults globally. On today's show, Dr. Leana Wen, emergency physician, professor at George Washington University, contributing columnist for The Washington Post, CNN medical analyst, former Baltimore Health Commissioner and the author of the forthcoming book Lifelines: A Doctor's Journey in the Fight for Public Health (Metropolitan Books, 2021), argues vaccinating young kids here should be an "urgent priority," plus talks about the threat of the Delta variant.