fill the vacancy if that would happen with just over three months left until the presidential election. just in the past 24 hours, trump has continued to fight with a gold star family, caused outrage by accepting a vet's purple heart and prompted president obama to make his harshest comments yet against his would-be successor. >> i think the republican nominee is unfit to serve as president. >> he's been one of the worst presidents in the history of our country, and for him to be calling me out is almost an honor. >> why are you still endorsing him? >> i always wanted to get the purple heart. >> you had your chance. you escaped. you dodged the draft. >> this was much easier. >> you should have pinned that back to that veteran's chest and should have hugged him and thanked him. >> all this controversy causing some prominent republicans to exit the trump train and work

against the standard-bearer. one big league donor saying they're going to work to elect the democratic nominee, hillary clinton. not to be outdone, trump is pulling ranks within his own party, the nominee refusing the back john mccain and paul ryan. ryan's primary in wisconsin is six days away. our political team, i want to get to nbc's katy tur who has been following the trump campaign from the beginning. she's outside trump tower in manhattan. katy, you're reporting the rnc chair reince priebus who is also very close with paul ryan is about apropos plek tick. how are they characterizing. >> reporter: the rnc and trump campaign don't seem to have good relations. i spoke with jason miller, one of trump's aides, and he brushed that off, saying they have a great relationship with the rnc,

also brushed off there was any internal squabbling and brushed off the idea that there might be a bit of a crisis going on between the party and donald trump. he said repeatedly donald trump is anti-establishment and go against paul ryan, going against john mccain is donald trump's message. he is not part of the political elite and that is what the republicans that have foeted for him like about him. that being said, the decks are stacked against donald trump right now. he has had continroversy after controversy. fight being a gold star family, told a baby to be quiet just the other day, but it wasn't interpreted like that. he has done so many things in the past couple weeks that there are almost too many to name at this point. donald trump has topped it off now by saying he's not necessarily going to endorse paul ryan, that he likes his primary contender a little better than him, that he wants strong leadership.

that's in addition to saying if a woman was sexually harassed a work, she should find new employment. the campaign doesn't believe this is an issue. they believe they're doing well in the polls despite the fact that our most recent nbc news survey monkey online poll shows he's not only still losing with women, but also starting to see his support among white men deteriorate. so the campaign, despite the fact they're trying to say everything is okay, is facing some real hurdles right now in order to get past this week and then potentially beat hillary clinton to get to the white house. but now there is some serious talk among the gop party about what they're going to do if donald trump continues on this path and what they would do if potentially donald trump dropped out of this race. that is still very early, thomas. there's no indication he would drop out. there's no indication he's even being told to drop out at this point, but they are looking at their options right now. >> katy, there are two different story lines here, one of donald

trump wanting to remain the anti establishment person. but however being the gop party standard-bearer. is there a way for the trump campaign to give a perception of unity and do right by the party that would ease, say, a reince priebus or other members that might be looking for an exit? >> reporter: it looks like that ship has sailed. donald trump has promised unity over and over again, talked about the pledge, said he would support paul ryan, talked about how much respect he has for reince priebus, how much respect he has for party leaders, has promised repeatedly he would back off attacking his fellow party members, but thats has not happened despite his promises. the idea that donald trump can come out now and present party unity is starting to become laughable within republican circles. i've been talking to gop operatives who say they just can't believe this, this is the final straw. what else could he possibly be doing or possibly do in order to

gain their trust back. they didn't trust him in the first place and this is that nail in the coffin. >> katy tur outside trump tower, thanks very much. joining me on the phone, nbc's hallie jackson. i understand you have fresh reporting, new info on what the sense is within the gop? >> reporter: thomas, what that 24 hours, right? i feel like i've been on with you over the last year in our network and we've said that phrase again and again, just another wild day in the party. today, yet again, you're hearing reaction members of the gop sources around the campaign saying things like "crazy town," saying "worse than ever." some frankly unsurprised. i've heard from a couple of folks saying i've been predicting this for a while with donald trump. i did have one top republican say to me, hey, i've seen a lot of people dismiss a lot of things. this last 48 hours, not just

with the chauns, but the final non-endorsement of paul ryan. donald trump has heard about this from all sides. he's heard about it from people in the party. he's heard about it from his staff. he knows it's a problem. he knows it's an issue. the question is, what does he do now? one of my takeaways from these conversations, this is where perhaps his family members come in. these are some of the few people who hold real influence, real sway over donald trump, who could maybe help him, convince him maybe to start moderating his tone, to do what many republicans want to see outside his campaign and start to dial it back little bit. i can't empathize enough, we have heard this again and again for months in this campaign, that trump needs to pivot, that trump has to figure out how to have a tone that is more palatable to people within his own party. it is 97 days until the election and we haven't heard it yet, thomas. a lot of question marks now over

what happens the next three days. the rest of this week will be key in seeing what donald trump does. specifically, i'm here in florida, out news gathering before we hop in front of a camera. what he does at the rally in daytona beach and jacksonville will be significant. >> so everyone understand, ryan did bactrim because trump sought that endorsement from the speaker. speaker ryan and his team say they have not asked donald trump for any type of endorsement. all this is borne out of the fact that donald trump sent a thank you tweet to the primary challenger of paul ryan in wisconsin. >> reporter: right. he sends this tweet, like a shout-out to paul ryan's primary challenger, he puts the tweet out to thank him for the backup, nealen having supported trump on different issues. that's where the question started. why is the top of the republican ticket giving a shout-out online

to the guy who is running against the top republican in congress. that is why you are seeing these comments now from donald trump about he's not quite there yet in endorsing paul ryan. thomas, i know you remember this. strikingly similar to something we heard from paul ryan back in early may, that paul ryan wasn't there yet in endorsing donald trump. you think donald trump remembers that phrase? i have a feeling he probably does. >> i think so. >> weeks later, about a month later he did publicly give trump his backing in what was a significant moment and a significant day in the campaign. we were there when it happened. but when you talk about this idea of how this unfolded, you've got to look at that history and that context between these two candidates. ryan's office does say that he never asked for the endorsement. let me give you some background as to why. paul ryan, at least up until this point has been expected to win this race fairly hand idly. he's fairly well liked in

wisconsin, expected to defeat his opponent. we will see if the trump situation has impact on the race. but right now not a lot of indication that it will. >> hallie jackson, great to have you on your phone. we will continue our reporting as it is crazy town almost every day. hallie, thanks. i want to bring in rick tyler. i have it on good sourcing that you were chuckling at that crazy town reference. if your reporting and who you have spoken to, high-level trump staffers feeling cold feet. donors holding back about giving, party leaders furious at this nominee. why has trump's recent behavior provided a catalyst now for concern because how is this any different from the cdidate we have seen ever since he announced his willingness and interest to be the gop nominee?

>> frankly, thomas, he has not made a transition. he is still fighting, litigating out the primary process. he's obviously sore. this is an alpha male thing, a bit infantile with paul ryan. by the way, that's not a trum district. he lost that district to ted cruz by 18 points. paul ryan shouldn't have any trouble winning that. this is more than a trump slump. it goes way beyond rationality. i think the campaign -- and i've read some reports that the campaign really is somewhat suicidal. they can't reign thn this guy i. fighting with a gold star family is beyond the pale. it's just eating up time. it's like a choke. every time he gets up to bat, he strikes out. these are not fastballs.

these are underhanded slow pitches he's getting and then he strikes back and goes back and argues with his teammates or argues with the fans. it's just amazing to watch. i think it may be too late. >> we have john harwood coming up. john is the person who had information sourcing about man ford a manna ford. they're kind of walking that type of description back. we'll ask john for clarification coming up within this hour and what he's hearing now based on response. but is there an option for the rnc if they do think that they have lost confidence within a trump nominee, to replace him, or if he would choose to drop out? >> i've got to believe on some level that trump does not want this. it's almost as if he's throwing it purposefully and seeing how far he can go. this is not a candidate who wants the presidency. if he did, he would become

disciplined. he would give people a vision. >> don't you think, rick -- that discipline has not been there from the very beginning. this has worked for him to beat the person you formerly worked for in ted cruz and all the other 15 people that were involved in those primaries. why do you think that a person who has shown you who they are is actually going to change and pivot when this is a working strategy and it has worked for this candidate to secure your party's nomination? >> it did work to secure the party's nomination, part of it was because donald trump was able to drive the news media. he had probably close to 98% name recognition which is the name of the game. nobody else was at that level. he positioned himself as the outsider. in the republican primary, that's what it was. if you you could be the outsider, you could win the race. ted cruz was the second closest. donald trump outmaneuvered him. now he's in a general election. he's not performing 234i where near the level he needs to do to

give people the idea he could be president. in some ways, i think he keeps changing the subject and makes these outlandish utterances because he knows on policy he will just get beat. hillary clinton knows a lot about policy. she can wax eloquent on policy all day long. donald trump is out of his depth here and shown that over and over again with the idea that he didn't understand the russians had already gone into the ukraine and crimea. it goes on and on. >> rick tyler, we shappreciate time. we now have ivanka trump speaking out after being brought into the sexual harassment debate about women in the workplace and how her father and brother describe what it would be like for her as an example. first, terrifying moments on board an emirates flight that crash landed in dubai. take a look at this. passengers inside the terminal capturing images of black smoke

billowing out of the boeing 777 in the middle east's busiest airport. incredibly all passengers and crew are safe and accounted for including six americans. the crash not clear. early indications report to a possible front landing gear collapse causing the plane to slide on its belly catching fire. it's your grandpappy's hammer and he would have wanted you to have it. it meant a lot to him... yes, ge makes powerful machines. but i'll be writing the code that will allow those machines to share information with each other. i'll be changing the way the world works. (interrupting) you can't pick it up, can you? go ahead. he can't lift the hammer. it's okay though! you're going to change the world.

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ivanka trump goes on the record about sexual harassment for women in the workplace after her father told "usa today" that he would hope his daughter would just leave a hostile work environment. donald trump said in that interview, quote, i would like to think she would find another career or find another company if that was the case. trump's son eric waded into this debate by trying to explain what

his dad meant as he appeared on cbs news. >> ivanka is a strong, powerful woman, she wouldn't allow herself to be subjected to it. you should certainly take it up with human resources and she definitely would. at the same time i don't think she would allow herself to be subjected to that. i think that's the point he was making and he did so well. >> now here is ivanka trump reacting the all the talk about her on fox news. >> i think it's -- sexual harassment is inexcusable in any setting. i think harassment in general regardless -- sexual or otherwise is totally inexcusable. if it transpires, it needs to be reported and it needs to be dealt with on a company level. we have a very strong hr team at the trump organization who is equipped to deal with these issues if they arise. you hope they never arise.

you hope you have a culture in which they don't arise, but when they do, it needs to be dealt with swiftly. >> this is all happening as "usa today" reports two female employees at trump companies, which fall under the umbrella of the trump organization allege they were fired after complaining about sexual harassment in the workplace. the paper found the claims after reviewing court documents. joining me now is fatima goss graves the senior vice president for program at the national women's law center. fatima, good to have you with me. break all this down for me. why did donald trump's response get such a negative reaction and backlash? >> what we know is that sexual harassment in the workplace is really pervasive, at least one in four women say they've experienced harassment in the workplace. very few people come forward and report it. the reason they don't is that the consequences are too often too steep despite the protections in the law. >> according to the u.s. equal

employment opportunity commission, as we look at facts about this, almost 7,000 charges of sexual harassment were filed in 2015. actually 17% of those were actually filed by men. so there is an issue with men and women in the workplace that fall into these uncomfortable conflicts of situation on what to do. only 398 were deemed to have reasonable cause. what's the economic impact on women? and also talk about this for men. there is a stigma, fatima, that goes along with this. you have to figure out if you want to be the person that could be pegged as the troublemaker or also the personal conflict as the person who just puts up with it and avoids it and has to live with it. >> when employees experience sexual harassment in the workplace, they're really put in a tough box. if they come forward and report and they have a company that doesn't take it seriously, that doesn't send a strong message, then they risk the sort of

retaliation and isolation and economic and professional costs that can be really long lasting at their own workplace, but beyond throughout their career. at the same time there are many things that employers can do to set a very different tone, to be very clear that harassment won't be tolerated in their workplace and they take it seriously when it does occur. >> so how big a concern for women and women's rights in the workplace going forward in a really unique presidential campaign, how should they consider the importance of their vote through this election cycle? >> there's a reason these issue are top of mind today, and it's because they matter to women and they matter to their families. you pointed out that men experience harassment in the workplace, too, and that's -- and that is the case. i think all people want to know

that their rights will be respected in the cork place and that they won't be put in this terrible box where you're having to choose between tolerating harassment and having the sort of job and income that you need to support your family. i expect these issues to continue to be really at the forefront because they matter. >> fatima goss graves with the national women's law center, thanks very much. >> thanks for having me. breaking news to report about this foiled plot -- excuse me -- arrest of a police officer in washington, d.c. and a foiled plot because he's accused of supporting isis. nbc news intelligence and national security correspondent ken delaney following that story for us. what is this about? there is a foiled plot or an officer involved with isis or all of the above? >> there wasn't duly a plot, thomas. what we have here is the first police officer arrested for

materially supporting isis. the guy's name is nicholas young, 36 years old, a metro transit police officer. authorities are saying there was no credible threat to the tran sis system, but instead what happened is this is a guy under scrutiny for many years, had some extremists believe, was a nazi sympathizer according to court records and was an isis sympathizer but never did anything to cross the line. authorities dangled an undercover informant under him and he, according to court records, purchased 20 gift cards that could be used on mobile messages overseas. >> how long was he on the force, ken? how long was he a part of the metro transit police force? >> reporter: since 2003 according to court records. he was arrested at metro headquarters without incident. metro knew about this. in fact, they brought concerns

about him to the fbi and they were cooperating with the investigation. >> ken del lanian out of washington, appreciate it. suicide squad. we've got the new details about the level of disarray inside donald trump's campaign that reportedly goes all the way to the top. is that a fair and accurate characterization? we have john harwood coming up. he is the person who had that intel, tweeting about it. we'll have that just moments away. we left on our honeymoon in january 2012. it actually evolved into a business. from our blog to video editing... our technology has to hang tough with us. when you're going to a place without electricity, you need a long battery life. the touch, combined with the screen resolution... a mac doesn't have that. we wanted to help more people get out there and see the world. once you take that leap, that's where the magic happens.

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me now. that tweet yesterday seemed to raise a lot of eyebrows. how bad are things within the campaign behind the scenes, and is that an accurate and fair characterization to say staffers are suicidal? >> well, suicidal in a metaphorical sense, not meant to be taken literally. things are really bad within the trump campaign. donald trump has come out of the convention period, falling behind in the polls, prosecuting, losing in hopeless arguments with gold star family and john mccain and kelly ayotte and doing things that indicate the professional campaign people who have been brought on to try to make him run an effective general election campaign are simply not breaking through with the singular style that he has of controlling the message every single day according to his whims. i've got to tell you, i just got off the phone with vin weber, friend of paul manafort, former lieutenant of newt gingrich in

the house, he said he's rejecting the trump candidacy and he doesn't believe paul manafort will go down with this ship. there are limits to the patience of everybody in involved, including the people working most closely with donald trump. >> paul manafort was brought in to kind of stabilize, put the adult in the room so to speak, of someone to helm what it meant to get to the republican national convention, to secure the delegates, secure the nomination. it's been a bare bones staff by any presidential standards. but would man fortd leave within the next three months or within the next month if things are that bad. >> i have no indication that he is preparing to leave, but vin weber is a good friend and ally of his, and so when he says i don't think paul manafort will go down with the ship, that tells me there's a level of discon fent that has some limit. i don't know when the limit is, but you talked about adult in

the room. donald trump has been rejecting repeatedly the political equivalent of adult supervision, and he is doing things in his own idiosyncratic style, but that is not consistent with moving from a general -- a primary campaign where he won in a very fractured republican field and adding the votes that you need for a general election. 130 million people are going to vote. he has to be additive now, not shrinking and he's doing the opposite. >> john harwood, cnbc's washington correspondent. thank you. we know donald trump will hold a town hall in battleground florida later today, part of his three-day campaign bus tour focused on jobs. nbc's jacob rascon is in daytona beach covering the trump campaign. what is expected to be heard from donald trump today if the message stays on job growth? >> reporter: what we don't expect are any apologies for him

to back down. the only time i can remember him saying he made a mistake was after the heidi cruz tweet, wu that was a couple weeks after the fact and already when it appeared he was winning. later he went back and sort of relitigated that. reexpect trump to be trump if that makes any sense. i've been talking to some supporters who have been out here lining up hours ahead of the daytona beach rally including dale martin. if you can step forward quickly, i know this is the first time you'll be seeing trump in person. you're excited about that. >> i'm excited to be here, and i appreciate him coming here to daytona beach, and i feel like he's the right man for our people. >> you have been watching the recent things that trump has said. even you, a very passionate trump supporter, you wonder if he's getting too off message here. what are your thoughts? >> i think sometimes he is.

it doesn't matter who tries to stand up, the media doesn't give anything except sound bites and usually they're a negative ones. i don't mean that towards you guys or anything, but if he could focus on the issue and let people say whatever they want to say. >> you want him to get back to the issues. >> get back to the issues. >> thank you so much, gale, for your time. we're seeing that, there are prominent trump supporters on twitter who say lies, lies, lies, all fabricated by the media. but there are some like gale who say, come on, get back to the issue. they hope they can hear that today in daytona beach. >> jacob rascon, we'll all see later today. appreciate it. we'll talk more about florida, a different story capturing headlines there with another case of zika reported in miami and now health officials say mosquitos carrying the virus are harder to wipe out than expected. we'll take you live to the city of concern after this.

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we've got a set bark when we talk about what's taking place for combating the outbreak of the zika virus in miami. rainy weather delayed this morning's plan for an aerial attack to spray the area that is most concerning to officials with an insecticide. they're going to try again at dusk. a total of 15 people have now tested positive for the infectious virus. i'm joined by dr. peter hotez founding dean from baylor college of medicine. the dangers really can't be overstated at this point. explain what folks need to be aware of. >> thanks for having me on. the overwhelming concern, of course, is that zika virus has the unique ability to infect pregnant women and cross the placenta and damage the unborn

fetus to cause a terrible congenital microcephaly, what we're calling fetal brain disruption sequence because it's blocking the development of the fetal brain. it's every parent's first nightmare. the overwhelming emphasis has to be on protecting pregnant women or women who think they might be pregnant from becoming infected. >> when we think about what's being done to combat the spread of this or get the control of this, the cdc is saying it's been harder than they thought to wipe out the zika carrying mosquitos. why is that? >> i'm not surprised. if you look back at the history, we've never embarked on a serious effort to control this type of mosquito in the southern united states. this aedes aegypti mosquito is found in many parts of south florida, as well as the gulf coast, including houston where we are and new orleans. it's a mosquito very difficult, it's specifically adapted to

live in human habitats. it lives inside homes, outside of homes, especially in areas where there's discarded tires and tv sets. it means, if you want to control this mosquito, it's not business as usual. what we do in the summer typical on the gulf coast of florida, send a truck around and lift a big fog of mist. that includes the mosquito carrying west nile virus. it really does this for this aedes aegypti. you have to go house to house to house to house almost in a military-style campaign, to apply insecticides in and around the home and be very aggressive at overturning any container that may contain water. it's not rocket science, but it's very labor intensive and it's expensive. that's why it's disappointing not to have the congressional funds right now. >> we know in the summertime in june in utah there was an elderly resident that died with

the zika virus. they haven't been able to confirm it was from the zika virus. he did test positive for it. this happened in salt lake city. you talk about pregnant women. as we get to snow bird season for florida, talk about the concern that those that come to vacation to florida and get away from the cold, that this is a concern for them, this is also a concern for couples, men and women who are wanting to conceive. >> the only silver lining on this is there are brackets on mosquito viruses. what happens is during the summer and early fall weeks are really the crunch time. actually, if you look at historically when we have big epidemics, viruses transmitted by mosquitos in the gulf coast and florida, it peaks around this time and starts to tail off as we get towards the end of september. it's really a matter of focusing

our efforts during the next precious few weeks. that's why it's so upsetting that congress has gone on recess. remember, arbo virus season on florida and the gulf coast is almost like hurricane season. congress left exactly at the time when zika virus should be peaking, and they're going to come back by the time when zika is going to be going down. it will be a little too -- too little too late in terms of u.s. congressional intervention. >> we'll see if they can do the dusk insecticide spray later today, bad weather again delayed that for this morning. dr. peter hotez, thank you. appreciate it. coming up, reportedly a campaign in chaos. we'll get you up to speed on trump's turbulent week and what it means for the republican party moving forward.

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the unusually high anxiety remains in the republican party over donald trump's bruising headlines. there are des plat pleas and hopes for him to get back on message. meg whitman says she's voting for hillary clinton. the former ceo of hewlett packard and 2014 republican candidate for governor of california says, to vote republican out of party loyalty alone would be to endorse a candidacy that i believe has ex-employed anger, grievance, xenophobia and racial division. i'm joined by francesca chambers and "washington post" columnist ruth marcus. ladies, good to have you with me. we've got the past 24 hours alone, donald trump picking fights with paul ryan, john mccain, kelly ayotte in new hampshire and even the mom of the crying baby or the crying

baby. he accepted a purple heart from a veteran. folks didn't think that was appropriate and he's lost prominent republicans along the way. how does the campaign right their current rocky ship? >> well, he needs to change direction so that this isn't what we're talking about all day long. one thing he could perhaps do is give a foreign policy address in which he addresses the relationship with russia and a few of the other things that have happened in the past few days and put the focus back on policy and the contrast between his policies and hillary clinton's policies. >> he said in the ashburn event, wouldn't it be great if we have a relationship with russia. that's as far as you get when it comes to a policy speech on russia. wouldn't it be great if we went out and took care of isis. >> well, in a foreign policy speech he could address iraq, syria, nato. there's a bunch of issues on foreign policy that president

obama brought up yesterday where he has disagreements with donald trump that donald trump could speak to. and like that, they could help to settle nerves within the republican party about his stance on these issues. >> former republican pptal candidate ben carson saying, hopefully donald trump will recognize, if you take the bait every time, you'll never have time to discuss the real issues. we have the upper hand on the economy, education and a whole host of things. there's no reason to engage with those who are trying to make this about something else. you pivot back to what's important. can donald trump learn from the mistakes of taking the bait or appearing thin-skinned and pivot back to what is important for the gop? >> i think the evidence is that the answer to that question is not. donald trump has told us repeatedly that when he is attacked, when he is, as he said, about the khans, viciously

attacked, that his instinct and his response is always going to be to attack back. he has shown absolutely no inclination or willingness or really even capability to do anything but that. so i think that all sentences about donald trump that begin with the word "hopefully," are not to be taken seriously because he is who he is. the republican party is going to this election with the nominee that they have, and i think they're joust going to have to fasten their seatbelts because trump is going to give them a bup pi ride, and there's no reason to think that's going to change. >> meanwhile, i don't know if you saw the interview by "the washington post" phillip rucker, over 50 minutes. the attack issue with the khans came up. he said i'm not willing to talk about that, but i was viciously attacked, and i'm moving on from that. and then, i was viciously attacked but i'm not going to talk about that anymore.

it seems as if it's a record stuck on that moment where he wants to talk about being viciously attacked over and over again and repeat that i won't talk about it anymore. >> there's two things i'd like to say about that in that fantastic interview by my colleagues. one is that trump is great at dishing it out. he calls people complete and total dummies, attacks them on twitter, on the debate stage, from the campaign trail, but he absolutely cannot take it so even vitt sichls of his positions on the merits are understood by him to be vicious attacks. the second that i thought is the most important and scary part of that interview was continuing and elaborating on his insi insistence that his election he fears is going to be rigged, because calling into question the notion of the legitimacy of an election, the prospect of losing nominee if he is to lose -- >> he did that on the primary route and it worked for him.

that's what garnered him this nomination. francesca, is he the best thing that's ever happened to hillary clinton and the democratic party? >> well, the clinton's campaign in response to this entire fiasco is that this is evidence he's unraveling and he's temperamentally unfit, as they said, to be president. >> it was a good read, but i recommend not reading it at 10:30 last night. >> you can read the whole transcript online. >> i did. my head hurt and i'm trying to go to bed. francesca chambers and ruth marcus, thank you. appreciate it. how much will his muscle ban proposal cost? ari melber joins me next with an exclusive report.

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if it was up to donald

trump, he never would have been in america. donald trump consistently smears the character of muslims. >> there is khizer khan talking about his son who died in service in iraq. that was mr. khan at the speech. donald trump defending his proposal to ban muslim incidents. it started after the shooting in san bernardino, california. >> donald j. trump is calling for a total and complete shutdown of muslims entering the united states until our country's representatives can figure out what the hell is going on. >> trump has described his position many different ways but never withdrawn the actual muslim ban proposal, even saying he'd expand it on "meet the press." >> i actually don't think

it's -- in fact, you could say it's an expansion. people were so upset when i used the word muslim. oh, you can't use the word muslim, and i'm okay with that because i'm talking territory instead of muslim. >> the new msnbc legal unit investigation provides the first comprehensive policy analysis of how a temporary muslim ban could actually be administered. chief legal correspondent ari melber is here with me. with the work collectively with the united, what were you able to break down and figure out what this would mean if it would actually go into place? >> trump has described this in many different ways. it's been derided by many people including paul ryan. how would it work? i went ahead with brad gold, maury house and our legal unit and talked to dhs officials and border agents about how you would implement this. they said it's impractical, unworkable, impossible. the reason is the scale of this. if you're going to vet people for religious beliefs, last year

189 million people came in and out of the u.s., 189 million entries, many people, 189 million total entries. if you wanted to vet them, the largest muslim country, indonesia, pakistan, only one of those lists religion on a passport. to do this ban, according to the ex-pirpperts we spoke to, you ho spend billions and billions to vet those people. $21 billion is about what we currently spend on immigration. we're told it could be 60 orr $80 billion. all of that would be that expensive because the government would basically be doing something it's never done before, which is try to interview or personally vet every person that might come into the u.s. to say are you muslim. experts say you'd have to vet them in a verifiable way. david leopold said it would

require a massive interrogation machine. that is expensive no matter how you cut it. >> mr. khan on hardball earlier this week and appearing with his wife and talking about this and immigration for america, he said that, while he doesn't support this, he does think extra scrutiny should be implemented for immigrants coming to america, more universal umbrella of scrutiny. how is that not possible? >> ultimately the question is whether you do vetting around security criteria, which is already done greatly. if you're from a country that's on the state-sponsored terror list, it's harder to get in than if you're coming from france. donald trump has normialized th notion of using religion. experts say there's a lot of reasons why we don't do it that way. >> ari melber, thank you very much. great reporting from you and the legal unit. back with much more after this.

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. that will wrap up this hour of msnbc live. i'm thomas roberts. i'll see you back here at 2:00 p.m. my colleague tamron hall will pick things up. i'm tamron hall from our msnbc headquarters in new york. we'll start with breaking news. a police officer with the washington, d.c. metro transit system has been charged with providing support to isis. this is the first time a law enforcement officer has been accused of helping the terror group. that according to court documents. the man identified as 36-year-old nicholas young is accused of purchasing gift cards for mobile messaging apps to help isis communicate overseas. the u.s. attorney says there was no credible threat to the d.c. metro system. we'll continue to follow the latest as we get more information. on to politics right now. wreer still waiting for house speaker paul ryan to personally respond to donald trump's stunning reversal to endorse him in his primary election next tuesday in