Public health advocates are watching in growing alarm as former President Trump increasingly embraces the anti-vaccine movement.  

"I will not give one penny to any school that has a vaccine mandate or a mask mandate," Trump said in a recent campaign rally in Richmond, Va.

It's a line Trump has repeated, and his campaign said he is only referring to school COVID-19 vaccine mandates — but that hasn't eased fears that the GOP leader could accelerate already worrying trends of declining child vaccination.