Operation Warp Speed’s chief scientific adviser on Monday defended the federal government’s rollout of COVID-19 vaccines, but acknowledged there is a “lag” in getting the vaccines administered. Officials with President Donald Trump’s administration said late last year that 20 million Americans would be vaccinated by the end of 2020. Instead, under 3 million people received vaccinations, out of some 12 million doses distributed to states, as of Dec. 30. Moncef Slaoui, the operation’s adviser, said on CNN’s “New Day” that “nothing has gone wrong.” He was then played a snippet of what he said last year, when he said officials expected 40 million doses to be shipped and 20 million Americans to be vaccinated by the time 2021 hit. “So obviously, I did say that, and, you know, that was our hope,” Slaoui said. The operation, a federal government effort, distributes vaccine doses to states, which are then in charge …