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we have been since the beginning of the covid virus. reporter: pfizer made the case for boosters with data showing wang vaccine efficacy after six months and said they will work with the fda to address the committee s questions and now questions about the biden administration s widespread booster strategy after the president made this announcement last month. eight months after your second shot get a booster shot. reporter: biden s push for a third shot is getting pushback from some of the nation s top medical experts who say he spoke too soon. the white house wrote in part, we stand ready to provide booster shots to eligible americans once the process concludes at the end of next week. that process includes a signoff by the fda which could come as early as next week, then the cdc s vote. it could be just days before millions more americans roll up their sleeves again. when it comes to the other two vaccines, booster rollouts is unclear. moderna we know has subm ....
they re going to be pulling some gs as they come through the atmosphere as the heat shield heats up to about 3,000 degrees fahrenheit. it will create a friction. that plasma is what s described as blackout zone where you don t have radio communication because the radio signals can t travel through that plasma. but they re inside pulling some gs, but it s not uncomfortable. it s a little bit when the gs pile up a bit, it takes a little more effort to breathe, but it s not too big of a deal. coming down, when i came down in a capsule in the soyuz capsule, there s a parachute. it s either going to come out or it s not. that was the big event for me. doctor, talk to us about the process when getting out of the spacecraft after a splash landing. how long does it take to get used to being back on land? oh, well, the process takes just a little while while they get the folks inside. but once they exit the vehicle, they ll probably have a little bit of sea legs once they ....
about 700 people. images from that january 6th riot will be burned in the minds of americans for years to come, that s why we see these massive preparations for whatever is going to happen today. on the political side republican congressional candidates are scheduled to appear, sitting members of congress who made an effort to brush aside january 6th haven t said much about today s rally. we haven t heard if any plan to attend. live to capitol hill, ellison barber is at the capitol, julie is inside. ellison, you were there for january 6th, i was following your reporting as things were getting scary. from your vantage point you didn t know everything that was happening. how are things looking there with less than five hours to go? reporter: it is quiet. it is fencing, fencing, fences, as far as the eye can see. there were bicycle racks january 6th. the heavyduty came after the insurrection took place. closer to the capitol an area to the left that was breached by insur ....
the same mind-set, and it s highly disturbing you still have people in america who want to take on democracy and destroy it. and this afternoon capitol police arrested a man for a weapons violation saying that he brought a long knife to the rally. let s go to nbc s elson barber joining us from there. i know the crowds are much smaller, but for the most part with they remained peaceful? yeah, i mean by and large they have. as you mentioned there was that one individual who according to capitol police was arrested. he is facing a weapons charge. they say he had a knife. we saw just a little while ago someone appear to be detained or at least surrounded and then escorted out of the area by capitol police in full riot gear. they sort of circled around this individual and backed out with them taking it behind the police barricade line. that was one of a couple of incidents we saw today. apart from that, though, thick things really did seem by and large peaceful. this was ....
stone updating its list of the 500 greatest songs of all time what do you think about the brand-new number one announcer: this is nbc nightly news with lester holt good evening, everyone the debate over covid booster shots may be coming to a head an fda advisory panel set to meet tomorrow to examine key questions. whether a third dose of the pfizer vaccine is safe or even necessary for everyone they re critical questions and a source of rare open disagreement among covid experts. the booster is backed by the biden administration but regarded with caution by even some within the fda. all this comes as the u.s. struggles to administer first doses. just over 54% of americans are fully vaccinated, and vaccine mandates are facing more and more challenges, which we ll get to in a moment miguel almaguer starts our coverage. reporter: divided over the science, tonight just hours before the fda advisory committee is set to vote on the future of boosters, members of the ....