mike: growing questions about president biden s vaccine policy and what medical basis the administration is using to claim that the general population should be receiving third doses. chief breaking news correspondent trace gallagher s on the case of those booster shots. good evening. good evening. president biden has repeatedly vowed to follow the science of the fight against covid-19 but instead of following, he has gotten ahead of science with statements like this. remember a simple rule. eight months after your second shot, get a booster shot. except scientists and experts have yet to agree if a booster is needed. still, the biden booster shot plan is supposed to begin next week pending approval from the fda. dft advisory committee will vote tomorrow on whether booster shots should be offered. the fda has already said overall data indicates currently u.s. licensed or authorized covid-19