breaking news reporting from cnn white house correspondent caitlyn collins. i appreciate you joining us. thank you very much for the update. >> reporter: no problem. >>> i want to bring in dr. jonathan rhiner and the doctor from the vaccine development and the decent of national school, the national school of tropical medicine at baylor college of medicine. doctors, thank you so much. i appreciate it. i'll start with you, this is big news. people have been wondering. people have been asking me. will we get a third shot? when will we know about a third shot? some americans are already coming on, up to their eight-month shot period, right? what does this mean for them now? >> so this really follows a trend that we've been following out of israel and there was also a recent mayo clinic study that has been showing what looks like waning immunity after six, seven, eight months. for a while we didn't know if it was true waning immunity or whether there was a specific issue around the delta variant or a combination of the two. it looks like there is indeed waning im

. >> as you can see, caitlyn collins and colleagues at the white house president biden has been briefed on the covid-19 origins. the white house is colorful behind you. what is going on? >> reporter: it's for the para l par p p paralympics. >> we'll continue to update you on the breaking news. >>> time is running out in afghanistan as we know. more than 70,000 people evacuated in ten days with the world watching. daddy printed out my permission slip, right? steven? (dramatic opera music) do you suffer from cartridge conniptions? be conniption-free, thanks to the cartridge-free epson ecotank printer. big ink tanks, a ridiculous amount of ink! the epson ecotank. just fill & chill. (announcer) carvana's had a lot of firsts. 100% online car buying. car vending machines. and now, putting you in control of your financing. at carvana, get personalized terms, browse for cars that fit your budget, then customize your down payment and monthly payment. and these aren't made-up numbers. it's what you'll really pay, right down to the penny. whether you're shopping or just looking. it only takes a fe

i want to start with kaitlan collins in washington at the white house and caitlyn, biden was under a lot of pressure to address the situation. he didn't want to. he wanted to not have to do it but came back to the white house. he was forced to do it this afternoon. what more are you learning about the timing of this speech and how it came about? >> yeah, erin, he actually was monitoring the developments over the weekend including the takeover of kabul but the taliban from camp david where he spent the last several days from the white house from there this afternoon after aides realized there was no option but to address what is happening given how far of a departure on the ground was from what president biden was saying six weeks ago about what he believed was the most likely. so ehe came back today with a defiant tone to withdrawal from afghanistan. i don't think that surprised anyone. certainly not aides from his inner circle. they know this is a position that is long held and expected to take once he won presidenty and took office and sworn in. today defending that decision, the o

kaitlan collins is "outfront" at the white house to begin our coverage tonight. caitlyn, when you asked your question of president biden, you know, he obviously knew that was going to come but he was clear, it's time for cuomo to resign. so from your reporting, what went into the president's decision and what happens because you then went there with your question about impeachment. what happens if cuomo doesn't do it? >> reporter: well, yeah, we knew president biden seen the coverage of this today and aware of the results of this investigation that came out just several hours before he was scheduled to speak to reporters because actually, when reporters saw him earlier in the day, he said he would answer questions on this later. yes, he was prepared for these questions on governor owecuomo. he said if this incest gages did confirm the accusations of these women and found them to be credible, which the investigators said it did, he would call on him to resign which he did today which is striking given the political alliance and what emanated from that. he did stop short o