The Trump administration’s vaccine czar said the country could start rolling out a COVID-19 vaccine this week once it is approved by the Food and Drug Administration.

Dr. Moncef Slaoui, the chief science adviser working on the government vaccine development initiative Operation Warp Speed, told CNN’s Jake Tapper that he is hopeful the vaccine candidate from Pfizer, and its German partner BioNTech, will be approved for emergency use authorization by the FDA after an advisory panel recommends its approval on Dec. 10.