Transcript for ‘Breakthrough’ COVID cases hit the White House
now. And some fully vaccinated staffers from the white house to speaker Pelosi's office have tested positive. And the urgent plea, Mitch Mcconnell saying do not listen to the misinformation, urging the unvaccinated to get the shot. Rachel Scott is at the white Reporter: Tonight, with the delta variant on the rise, president Biden imploring Americans not to let their guard down. We have to stay vigilant, especially with the delta variant that's out there. Reporter: It comes as the white house acknowledges that a fully vaccinated staffer has tested positive for covid-19, and that there have been other positive tests too. I asked just how many we're talking about. Would the administration ever provide the number of breakthrough cases that have happened within the administration thus far, should we not expect to receive a number on that? I said I'd be happy to check on the status of that, sure. Reporter: On capitol hill, a fully vaccinated spokesperson for house speaker Nancy Pelosi also tested positive. Republicans have been less likely than Democrats to get vaccinated. Former president trump quietly got his shot before he left office, but rarely urged supporters to get theirs. But the number two Republican in the house, congressman Steve Scalise, finally getting his first pfizer dose, saying, "Especially with the delta variant becoming a lot more aggressive and seeing another spike, it was a good time to do it." Senate minority leader Mitch Mcconnell, pleading with Americans not to believe all the anti-vaccine misinformation. The way to defeat getting back into the position we were in last year is to get vaccinated. This is not complicated. I want to encourage everybody to do that and to ignore all of these other voices that are giving demonstrably bad advice. Reporter: And even on Fox News, where hosts have downplayed the threat of covid, Sean hannity now urging his viewers to get their shots, saying, "I believe in the science of vaccination." And despite the covid positive cases, the white house is not making any changes to its protocol tonight. The president gets tested every two weeks, and we've asked the white house that same question tonight. But no word on just how many fully vaccinated staffers have tested positive. Rachel, thank you. And new concern with just three days until the Tokyo
This transcript has been automatically generated and may not be 100% accurate.