about strains spreading in the u.s. the overall progress on vaccinations is encouraging. the daily rate is going up. the nation now averaging a new record for daily vaccinations around 2 1/2 million doses per day. that is a relief to see. >> this all comes as the biden add administration is scrambling to find shelter for migrant children at the u.s.-mexico border. 422 of those children are in u.s. custody. they plan to move thousands of migrant teenagers to a conv convention center in dallas. we'll get to more on the push to vaccinate america. elizabeth cohen is us with. the daily vaccinations keep going up, that's great. you have the big gatherings without masks like we saw images of and serious hesitancy, mainly from republicans. >> that's right. it's interesting. in a way we can't visualize the hesitancy. so many people are getting vaccinated which is great. i've been talking with public health officials that are concerned that once everybody that wants the vaccine gets it, we'll be left with an unfortunately sort of chunk of america that doesn't want it. cnn polling showed that half of republicans say that they will not try to get the vaccine. now, of course, many of those republicans would look up to trump as their leader. and we know that trump was vaccinated along with his wife back in january. but he has not talked about it. so cnn asked the department of health and human services would it be helpful if trump stepped up and talked about the need to be vaccinated. let's take a listen to his answer. >> i think it's very important for former president trump as well as the vice president to actively encourage all the followers to get the vaccine. the people who follow former president are very committed to president trump. and i think his leadership still matters a great deal. >> now if too many people say no to the vaccine, there could be real problems with herd immunity especially in certain areas of the country that have high rates of people who have not been vaccinated. poppy? jim? >> all right. so let's talk about one category that hasn't been vaccinated yet, young people. children. but moderna is moving forward with the next phase of the pediatric vaccine trials. what are we learning? are we finding it to be safe? what does that mean on timing as to when it will be approved for kids to get this? >> right. so moderna's vaccine was approved in december. but just for 18 and older. so now they are just starting a clinical trial with children. so let's take a look at some of those numbers. they're going to try it out in nearly 7,000 participants ages 6 months to 11 years old. these children will be in canada and the united states. and they're testing different doses to see if maybe the little ones, the 6-month-old to 2-year-olds if they need a different -- if they need a different dose than older children. pfizer is actually ahead of moderna in this area. pfizer fully enrolled their clinical trial with children back in january. so we're expecting news from pfizer before moderna. still, it will take months to fully test this out on children. poppy? jim? >> understood. we'll watch it closely. it's all moving more quickly than i think anyone would have expected. elizabeth cohen, thank you very much. well, the pandemic is not keeping spring breaker as way from the beach. big crowds swarmed south florida over the weekend. one mayor says the visitors just aren't worth the revenue due to dangers from the pandemic. miami beach mayor joins me now. mayor, thanks so much for taking time this morning. >> thanks for having me, jim. >> so we have seen the pictures. i'm sure many of the viewers have. i mean, it's amazing. it's like, you know, prepandemic sort of levels in behaviors here. we know what the science says about that. get people together like that, you're going to spread this thing. what have your medical advisors told you about what the consequences will be of this to miami? >> the problem is not just miami. the problem is we have too many people coming. we have too many people coming that want to just let loose in ways that are unacceptable. and we have a pandemic including i think really sort of ground central for the variant. there are a lot of things to be concerned about. our medical advisors say exactly what the national medical advisors say. this is all a very careless and in fact, you know, it easily be something that spreads elsewhere. we don't want it because honestly it's not healthy for our residents. we certainly don't want to be a hub of a problem that affects other communities locally or elsewhere. >> your and other local leaders are in something of a battle with your governor, right? he's tied your hands and said you can't even if you want to issue mask mandates just to stop the spread which the science shows, stops the spread. what do you do about that? how do you handle that? >> well, we were the first city i think in the country when the cdc said to have masks that we made a mandate about it. we gave over 1,000 fines for it. the governor said we're not allowed to do. that recently he said you can't do anything to promote that kind of compliance. we're doing the best we can. we have good will ambassadors on saturday alone that gave 7,000 masks unit masks out to people. the problem is that the message people are getting from the governor and others is that they shouldn't have to worry about this. >> yeah. >> because it -- and that's the hardest thing. you know, when we told people to wear safety belts, everybody wore safety belts. when we tell people a hurricane is coming, they all worry and do what you're supposed to do. now they're getting mixed messages including from the most prominent voice in the state which is very hard to overcome. >> yeah. listen, tseat belt thing, peopl didn't want to wear seat belts due to freedom issues as well. it's not all bad in florida by any means. if you look nationally, florida ranks better than most states both in new infections and deaths. 22nd for case rates. 24th for death rates. from your perch, what is florida doing right? >> first of all, our country handled this horribly compared to other developing nations. being in the middle of one of the nations that didn't handle it well is hardly something to be crowing b my county is bigger than a dozen states. i imagine we're not in the -- doing better than most places. we've had a day last week where 52 people died in just miami-dade county. so i don't think -- i don't think it makes anybody feel better that we're -- that there are other place that's are worse. and every time we open up without the mask mandate, we have a surge that caused more people to die. so i -- you know, sort of absurd to say, you know, it's fine because other places are worse. that makes no sense at all. certainly to the families of people that have parished or hospitalized. >> you want to hold yourself to a higher standard. before you go, i want to ask you about vaccine hesitancy along party lines. new polling shows that close to half of people identified republicans are saying they will not get the vaccine. and listen, we talked about this a lot on this broadcast. it is product of disnfcinformat. it goes back months. pandemic is not serious. saw that emminating from the white house and beyond. are you seeing that in miami beach? can you get over that? if this is along party lines, we're not going to get to herd immunity. >> listen, we, for some reason, we politicized mask usage which is obviously absurd. now we're politicizing vaccine, you know, taking the vaccine. it's crazy. and i think it's incumbent on responsible leaders to stand up and say take -- wear the mask. take the shot. irdon't know what's going on. but it's contrary to what america is all about. when people refuse to do things that will help themselves, their loved ones and strangers. that -- you're supposed to lean into this not run away from it. >> yeah. well, listen, i hope folks listen. it's not just for other people's safety. it's for their own. mayor dan gilbert, thank you very much. best of luck to you and people in miami beach. >> thanks. this morning the biden administration's working to find shelter for thousands of unaccompanied migrant children being held in their overcrowded border patrol facilities. it is now planning to use a dallas convention center to hold temporarily more than 2,000 migrant teenage boys. >> homeland security secretary with a warning this morning to any migrants considering making the journey to the u.s. >> we are building the capacity to address the needs of those children when they arrive. but we're also in critically sending an important message that now is not the time to come to the border. do not take the dangerous journey now. give us time to build an orderly, safe way to arrive in the united states and make the claims that the law permits you to make. >> quite a clear warning there from the dhs secretary. more than 4,000 migrant children are currently in border patrol custody. these kids coming on their own. right? many delivered by smugglers. the situation at the overcrowded border processing centers growing more dire by the day. the dhs warning the u.s. is on pace to encounter more people on the southwest border than has been seen in this country in the last 20 years. >> our rosa flores spoke to people who made the dangerous journey from their homeland but are now waiting and they are worried. watch this. >> reporter: as tens of thousands of migrants make the dangerous journey to the u.s. southern border -- >> someone stole all her money along the way. >> reporter: many discover getting here is just the beginning. some migrants describe -- crowded immigration processing centers. he says it was packed with people. withou without showering facilities and some say they slept under a bridge overnight. on pebbles and sand while waiting to get transported to immigration processing facilities. once there, migrants say they get three meals a day. this as cnn learns about 4200 unaccompanied migrant children are in border patrol custody. attorneys blowing the whistle this weekend about children in overcrowded and unsanitary conditions at this massive temporary immigration processing center in donna, texas, where unaccompanied children including many under 10 years old are being held. some for five to seven days which is against u.s. law. peter shea is a lawyer representing thousands of unaccompanied minors and says capacity at the donna facility is 1,000 detainees and right now it's holding about 2,000. >> it is an untenable situation. the administration needs to address immediately. >> the head of homeland security directed fema to help create more shelters for unaccompanied children and move them out of border patrol custody quickly. dhs says border patrol officials do everything they can to take care of unaccompanied children in their care. as for mothers entering with children, many are released by border patrol at this bus station in brownsville. >> why did you come here? because of the economic crisis in her country is very severe. >> the reasons migrants say they're trekking to the united states varies. some like this man -- says he lost everything during a recent hurricane in honduras. and this woman says the toughest part of her journey is when they are daughter was hungry and had no food. she says she's here because of the lack of jobs and the abundance of violence in her home country. cnn has made repeated requests to border patrol and border protection to get access to the donna facility you see behind me and other processing centers like it. and that access has been denied. today we also asked about those migrants who say that they slept under a bridge on dirt overnight. we have not heard back. rosa flores, cnn, donna, texas. rosa, thank you very much for that important reporting. we have a lot ahead. president biden heads to pennsylvania to promote the benefits of his american rescue plan. what he says you can expect in the next ten days. >> plus, news of a possible setback in a trial of a former police officer charged in george floyd's death. does a $27 million settlement from the city stand in the way of a fair trial for derek chauvin? 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