he ties it to january 6th. he's calling for change to senate rules. will that happen, though? more on that coming up ahead. but we want to start with that major update from the fda on booster shots as covid cases are hitting new heights. alison barber is outside a new york city school as children in the nation's largest school district return to class with new testing protocols. meghan fitzgerald is in chicago with new vaccine requirements there today. also with me dr. hilton, associate professor in critical care medicine at the university of virginia. she's also an msnbc medical contributor. dr. hilton, we'll start with you. the booster shots out this morning. three announcements. first, they are now allowing for pfizer boosters for teenagers age 12 to 15. second, they're now allowing a