now, up on the hill today, you're right, there was the testimony of several of the government's top health officials. dr. stephen hane head of the fda, he was asked this point blank hypothetical, liz, will you and your family eventually take an approved vaccine? this was his response. >> absolutely, yes, senator, mr. chairman. i have the complete and absolute faith in the expertise of the scientists who are terrific at fda. if they were to make a determination that a vaccine would be safe and effective, i would do that, and i would encourage my family to take the vaccine. >> reporter: also testifying, dr. anthony fauci. fauci today continued to reit rate that an answer on a vaccine, in husband belief, is at least -- in his belief, is at least a month plus away. >> we feel cautiously optimistic that we will be able to have a safe and effective vaccinal although there is never -- vaccine although there is never a guarantee of that. we predict that sometime by the end of this year, let's say november or december, we will know whether or not these are safe and effective. >> reporter: we will be hearing, liz, from presid