elderly. but we're seeing even more people who are children, and people under the age of 50. brianna. >> yeah, it is too late for some people, nadia, we know that. it is not too late for others. so get vaccinated. nadia romero, thank you so much for that. this delta variant of covid spreading across the country, and some experts are calling for more restrictions on eligible adults who are still refusing to get vaccinated. in an op-ed for usa today, two university professors suggest that the unvaccinated be required to disclose their vaccination status, quarantine when they travel and pay higher health insurance rate. they also call for the implementation of so called vaccine passports to curb recent surges in infections. joining us now is professor arthur kaplan, he is the director of medical ethics at nyu's grossman school of medicine. one of the authors of the op-ed, and professor, one of the things you write about is there's been this approach of sort of personal freedom but that the time on that has really expired.