The Food and Drug Administration rejected proposals floated by other federal health officials for cutting COVID-19 vaccine doses in half to cover twice as many people will provide.

“We know that some of these discussions about changing the dosing schedule … are based on a belief that changing the dose or dosing schedule can help get more vaccine to the public faster,” FDA Commissioner Stephen Hahn said in a statement Monday evening. “However, making such changes that are not supported by adequate scientific evidence may ultimately be counterproductive to public health.”