Happening again . With the u. S. Out of afghanistan, what are the Terror Risks . From Al Qaeda to isisk. And authorities at home who now warn the greatest Terror Threat may come from right here. Martha raddatz and Pierre Thomas live from the Pentagon And Justice department. And the coronavirus tonight. President biden doubling down on his Vaccine Mandate that will affect up to 100 Million americans, including federal workers, companies with 100 workers or more, and healthcare workers, too. Rachel scott asking the president about republicans threatening to sue. The president s response tonight. The u. S. Now reporting about 140,000 new cases a day and more than 1,100 covid deaths every 24 hours. Tonight, there is also major news from the cdc, the new studies on Vaccine Efficacy. Which vaccine performs best at keeping people out of the hospital . Dr. Jha standing by to answer your questions tonight. Overseas, a second Rt Cchar Flight now leaving afghanistan. Americans among the passengers. Where things stand on getting the remaining americans out. The supreme Courts Refusal to block that Texas Law banning most abortions in the state. What Justice Breyer says could happen next. A Special Edition of World News Tonight begins now. Good Evening Tonight from Ground Zero in lower manhattan. We are here as the nation prepares to mark 20 years since 9 11. The deadliest Terror Attack on this country. Tonight here we remember the lives lost, we recognize the survivors, the Weight Theyve carried all these years and of course we honor the heroes, the first responders and their bravery. You can see the reflecting pool is over my shoulder. The names lost etch in the bronze. Blue skies, a beautiful crisp September Day just like that morning 20 years ago tomorrow. There will be ceremonies at all three Sites Tomorrow Morning where the attacks unfolded. President biden will visit all three over the course of the day, and of course it was right here 20 years ago tomorrow that the world watched as the first Plane Hit. Then the second Plane Hitting 17 minutes later. 2,753 people were killed. Just this week, two more victims identified through Dna Testing and tomorrow, as they do every year, they will read the names of those who were lost. Former po former President Obama will be here with President Biden. A second flag unfurled at sunrise on the side of the building where flight 77 struck. Lloyd austin will lead a ceremony to honor the people killed. 125 of them there working that day and of course 59 people on Board Flight 77. President biden will lay a wreath there later in the day. And at the flight 93 national memorial in shanksville, President Biden will address a private ceremony for those who died on the plane, bringing the plane down in the field before it could strike another symbol of america. President biden will make no public Remarks Tomorrow as he and the Nation Mark a very difficult day. But a short time ago, the president releasing a message on video on the eve of one of the most awful days in u. S. History. Unity is what makes us who we are, america at its best. Of september 11th. Central lesso its that at our most vulnerable, in the the you shpu pull of all that makes us human, in the bat of the soul for america, unity is our greatest strength. President bidens message just a short time ago. And right here tonight, the survivors, the first responders, and the families who lost Loved Ones 20 years later. Their hope for this country and what we never knew about that day. But first, the other news this friday night, and there has been strong reaction to President Bidens new Pandemic Battle Plan and new mandates that affect up to 100 Million american, requiring companies with 100 workers or more to get vaccinated or get weekly testing showing workers are negative the. The cdc out with several studies on Vaccine Efficacy and the studies eye opening, which vaccines best at keeping people out of hospital, and what this could mean for boosters and when going forward. More than 73 of people 12 and older have now received at least one dose. Tonight these new numbers on Vaccine Efficacy and dr. Jha standing by with what this means but first, Matt Gutman from california. Reporter tonight, as the country staggers past that grim milestone of 1 in 500 americans killed by covid, millions of american workers face a new reality the president s sweeping move to mandate vaccinations. The right thing to do is to mandate it, unfortunately, because a lot of people are passing away. I understand the intention, but at the end of the day, i still feel like people should have the right to choose. Reporter and already republican governors in at least 19 states blasting the new rule for businesses. You should not lose your job just because Joe Biden is having this hissy fit. Reporter the governor of South Carolina saying he will fight them to the gates of hell. Those 19 states, with some of the nations lowest vaccination rates, have seen covid cases surge this summer. Our Rachel Scott today pressing the president on republicans vow to fight those mandates. Mr. President , what is your message to republicans who are calling your vaccine requirements an overreach, who are threatening to challenge it in court . Have at it. Have at it. Look, i am so disappointed that particularly some republican governors have been so cavalier with the health of these kids. Reporter the president bracing for the political battle ahead. 75 of americans already partially vaccinated. The White House aiming to reach the last quarter of american adults who remain unvaccinated. And tonight there is fresh evidence the vaccines remain highly effective in preventing severe symptoms, even against the delta variant. The cdc reporting today more than 90 of patients in hospitals are unvaccinated. Those who were unvaccinated were about four and a half times more likely to get covid19, over 10 times more likely to be hospitalized, and 11 times more likely to die. Reporter but data showing the vaccine is slightly less effective for older people. About 80 effective at keeping them out of the hospital versus about 90 for younger people. Just this week, President Biden saying that the decision over the booster shot, that third shot, is in the hands of the fda and the cdc and the administration will distribute them as soon as theyre authorize. This map showing the relentless spread of the virus just over the past six weeks. Kentucky, today, calling in 300 more National Guard to its hospitals. Were already at max capacity. Were already stretched so thinw Winter Surge that we can count on every year . Lets bring in Matt Gutman back with us tonight. I want to get right back to what the cdc said today. They reported some significant differences among the three vaccines and their ability to actually keep people out of the hospital is this. Reporter david, those numbers really are significant in the cdc. They show us that moderna, 95 effective at reducing the risk of hospitalizations. Pfizer, 80 . Johnson johnson, just 60 , and these numbers are certainly going Play A Factor in the can hve going forward about boosters and their timing and dosage between the different vaccines. David . Matt gutman reporting tonight. Matt, thank you. I know many of you at home are going to have questions about all this, Vaccine Efficacy, keeping people out of the hospital, and when are the boosters coming. I want to bring in dr. Ashish jha. Always great to have you. I want to get right back to the results. One study actually broke down across age groups showing the Moderna Vaccine performed best in terms of reducing risk of hospitalization, 95 . Pfizer, 80 effective at keeping you out of the hospital, and Johnson Johnson came in at about 60 . Im curious, what do you make of the Numbers Tonight . Thanks for having me back. I think the evidence really is that the mrna vaccines, moderna, pfizer are holding up quite well. I dont know that the difference between Moderna And Pfizer is clinically that meaningful. Johnson johnson coming in lower, concerning. I think we have to think about how we protect people with Johnson Johnson and whether they need an extra shot sometimes soon. You bring up the issue of boosters. Cdc said these studies found Vaccine Effectiveness wanes more among older adults, which is not entirely surprising Given Age and the fact that they were among the first to get vaccinated. We heard the Cdc Director say she expects the standard for fully vaccinated the definition in this country, might actually change. When you heard that, does that mean fully vaccinated could one day include this additional shot, the booster once its authorized . Yeah, so, we do have vaccines that are three doses in order to be fully vaccinated, hepatitis b, for instance. Right now two doses offer a high protection but i would not be surprised if over the next months, coming year, we have three shots to be dr. Jha, thanks as always. We do move on now to september 11th. I know for many of you at home, its hard to believe 20 years have passed since the attacks. We know the pain is still raw for those who lost Loved Ones and for survivor who is told me all these years they carried weight when they survived, their friends, colleagues did not. We have turned to survivors we have for decades here, lives forever linked by that day. The morning of 9 11, it was warm. It was clear skies. It was a beautiful fall. Reporter it was a clear, beautiful morning. Yeah, it was. I would walk past the fire department, and so i could say hi to the firemen that i would see all the time. Reporter you were making breakfast for the girls in the kitchen. I was. We had gotten up early. It was anna claires first day of preschool. Im diane sawyer, and its Tuesday September 11, 2001. I turned on the television to watch the news. Reporter this was your second day on the job . My second day on the job, yes. Reporting to the pentagon for work. Started out like a regular day. Reporter they are the stories of 9 11, forever linked by what happened that day. This is at the world trade center, and there has been some sort of explosion. Reporter 17 minutes later, the South Tower hit. The Plane Hit one floor above you . Yeah. And i realized if i had stayed up there, i would have been dead. What caught my attention was the fact that people that i knew were 100 and 100plus stories up, were hanging outside of the window. And i watched them. They were making a sign of the cross, holding hands, and jumping. To me those people were heroes. Reporter the pentagon was next. 9 37 a. M. We now have a report that fire has been confirmed at the pentagon. Reporter Air Traffic controllers were still trying to track down every plane. They hear sounds of a struggle from flight 93. Negative contact. Were looking, united 93. Hey hey Mayday Mayday Reporter deena burnetts husband, tom, on board. You were actually on the phone with his mother when he clicks in, and he says to you im on united Airlines Flight 93, newark to san francisco, and the airplane has been hijacked. He said that he was putting a plan together to take back the airplane, that there was a group of them. He told me they were waiting until they were over a rural area. I just remember being an old Flight Attendant. That Training Kind of kicked in, and i just said, you need to sit down, be still, be quiet, and not draw attention to yourself. Reporter and when you told him as a previous Flight Attendant yourself to stay in your seat and not draw attention to yourself, did you suspect even in saying that, that was not going to work . I knew as the words were coming out of my mouth that it was the wrong thing to say, because he yelled back into the phone. He said, no. No. If theyre going to drive this plane into a building, were going to do something. Reporter they had a plan. Had a plan. Reporter other Loved Ones would call home too. Flight Attendant Ceecee lyles calling her husband, lauren. Please tell my children that i love them very much. And im so sorry, babe. I dont know what to say. Theres three guys, theyve hijacked the plane. Im trying to be calm. Were turned around, and ive heard that theres planes thats been been flown into the world trade center. I hope to be able to see your face again, baby. I love you. Goodbye. Reporter back in New York its gone. The whole tower its gone. Holy Crap Reporter the South Tower comes down. Inside the only tower still standing, Captain Jay jonas. I got a couple of feet away from the stairway door, and it starts. The collapse of the North Tower with us still inside. Get in here get away from the blast. There it comes. Get behind. Oh, manyy god. Oh, may god. Oh, my god youre right. Oh, my god, you saved my Life Reporter somewhere in that debris, jay jonas and his team, when suddenly they see a piece of sky. And all of a sudden a ray of sunshine hit the stairway. And i looked up, and could see like a little sliver of blue sky. I said to the guys, guys, there used to be 106 floors over our heads. Now i see sunshine. So i think were on top of the world trade center. I just shake my head. I says, i cant believe im here. Reporter of the last 25 people out of the South Tower, florence was number 18. We have followed her for nearly 20 years, and we will never forget seeing those reflecting pools for the first time. The names of the fallen etched in bronze. And florences friend, jill maurercampbell. I always remember jills smile. I try never to think about the way she died. As a company, we were very, very close. We all knew jill. Reporter she was a young mother who proudly brought her baby to work. And now 20 years later a Phone Call from jills son. Oh. I was so happy to talk to him. Later tonight here, you will hear what was said in that Phone Call. Its hard to imagine a son who never knew his mother calling florence 20 years later and asking her, can you tell me anything about my mother . And youll meet that son. Youll hear about the firefighters buried in the tower who somehow survived. The bravery inside the pentagon, the woman who reached out through the smoke, someone grabbing her hand. We reunite her with the man who saved her. The heroism on flight 93, the Phone Calls the loves ones back home. We honor them all tonight. Our abc news Special Presentation begins at 9 00 p. M. Eastern right here. Before we move on, we have one more question in all this because its a central question for so many americans. Is our country safer. How do we keep this from ever happening again . I want to bring in Martha Raddatz live at the pentagon tonight. Our Chief Justice correspondent Pierre Thomas live at the Justice Department. Martha, first to you. You reported from afghanistan earlier this summer. We all know the u. S. Is out, but what about the taliban, the remnants of Al Qaeda, and of Course Isisk all still in that country . Reporter both the secretary of defense and the chairman of the joint chiefs warned back in june that Al Qaeda could regenerate and pose a threat to the homeland in just a few years and that was before afghanistan fell to the Taliban And Isis carry out that suicide bombing. Now pentagon leaders fear that could happen much faster and of course we no longer have to military there, david. Pierre, i know federal authorities told you that for some time now, the potential Terror Threat for the u. S. 20 years later might just be right here at home. Reporter today the Homeland Security Secretary said the greatest Terror Threat to america is domestic, often motivated by hate. But while the domestic Terror Threat may be expanding, in recent weeks the fbi has been Warning Radicals inspired by isis and Al Qaeda have been on Social Media urges attacks. So though no credible threat has been identified on the 9 11 anniversary, these are tense times. The fbi is investigating thousands of terrorism suspects domestic and internationally inspired. Again, our special this evening, 9 00 p. M. Eastern, and Die Yannian and robin and i will be here. 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