turning to politics and the new developments there. republican front-runner donald trump made a high-profile appearance a couple hours ago. not a campaign event but at a courthouse here in new york where he reported for jury duty. in fact, you can see the crush of media and bystanders as trump made his way from his limo to the courthouse in manhattan. all of this coming a day after he offered his policy proposals, taking a hard line approach on illegal immigration. in a six-page policy paper issued yesterday, trump said he would deport all undocumented immigrants from the u.s., reverse a law that grants american citizenship to any child born in the u.s. and rescind president obama's executive orders on immigration. >> the executive order gets rescinded. one good thing about -- >> you'll rescind that one, too? you'll rescind the dream act? >> we have to make a whole new set of standards, and when people come in -- >> you want to separate families? >> chuck, we'll keep the families together. we have to keep the families together. >> but you'll send them all out? >> they have to go. >> what if they have no place to go? >> we'll work with them. they have to go. either we have a country or we don't have a country. >> in his policies, trump also says mexico should pay for a border wall, and says until they do, among other things he would increase fees on all temporary visas issued to mexican ceos and diplomats, increase fees on all border crossing cards and increase fees at ports of entry to the u.s. from mexico. >> they have the money. they will pay for the wall. they're sending drugs and they're taking money out. they're making a lot of money. mexico is making a lot of money. i'm a big fan of mexico. i'm a huge fan of the mexican people. i have thousands of mexican people working for me right now and have over the years. but they have to pay for the wall. and we need the wall. do you know that ten years ago, hillary and everybody wanted a wall and then they said, oh, it's too expensive. you're one of the reasons of the environmental impact statements. >> you believe you'll be able to streamline that? >> i'm the best builder in the country. >> trump also said he would triple the number of immigration officers, enforcement officers and the cities that will cooperate in federal round-ups. among all of that, the first national poll since the republican debate shows trump maintaining that double digit lead over his gop rivals. he's in jury duty. he's part of the pool there. it's incredible timing, to say the least, katie. now you have the spectacle of iowa, and now back on his home turf, another spectacle of cameras and news press following donald trump. >> it's like going full circus in many ways. it doesn't matter if it's new hampshire, the iowa state fair, an appearance at jury duty, he has this crush of press around him. he'll do these 20, 30-minute press avails where he'll talk to a number of reporters, answer questions. he doesn't skimp on the questions, yet when you leave these rallies, you still see a number of reporters and cameras crush him as he goes out trying to get another word or two from him. i think it's because he is so unpredictable. you never know what he's going to say, and you always want to have a microphone in there in case somebody else is getting him saying something that could be potentially very controversial. but here he came out of his limousine right here. usually he travels in an suv, but this time he was in a limousine, and walked up these stairs almost glad-handing, if you will, with reporters, answering questions, saying he felt fine. saying that the wall would work, then stopping at the top of the stairs and waving, almost like he's the presumptive nominee already. we are getting some details on his immigration policy, as you said, a little meat on the bones that people have been asking for. unclear, though, what the reaction will be as of now for the details for those policies. right now nbc news is crunching numbers to find out how much money you could potentially get from all those proposals he put out there and whether or not that would be enough to pay for a wall. >> all right, katie, thank you very much. we'll talk more about the trump campaign, but we do want to get you caught up on what's happening on the democratic side. hillary clinton is preparing for her next scheduled town hall appearance. that's in las vegas tomorrow. over the weekend she appeared at the iowa state fair where some say she was actually upstage bid trump, and as katie described it, the circus that has been following him, including offering kids a helicopter ride. meantime, hillary clinton joked about her ongoing e-mail controversy. >> by the way, you may have seen that i recently launched a snapchat account. [ cheers and applause ] >> i love it. i love it. those messages disappear all by themselves. >> well, the washington times reports as many as 60 e-mails have been flagged so far for possible classified information. and in the new fox news poll, 58% say the former secretary of state knowingly lied when she said there was no classified information in her e-mail. 33% say there is probably another explanation, 54% say the country's national security was put at risk by her use of that server. nbc political correspondent casey hunt joins us live from the iowa state fair where hillary clinton campaigned over the weekend. we have a little cover of donald trump at the white house. i'm curious how you would describe the reaction in the clinton camp to all the trump fanfare and whether or not they were prepared, truly, for that. >> reporter: well, tamron, i think that, honestly, how do you prepare yourself for donald trump? i was in the middle of those crowds all day on saturday, and clinton's campaign, look, she had a huge crowd of admirers there. she's a global celebrity in her own right, and there were many people here at the fair who were just absolutely thrilled to see her. but she was, at a certain point, literally overshadowed by that trump helicopter that flew over top of her. i honestly think that it's not the worst thing in the world considering the difficulty they're having right now with this e-mail issue. it's not the worst thing in the world from the campaign's perspective to have a distraction going on. we're certainly spending plenty of time covering her e-mail issues, but the bottom line is if trump wasn't in this race, there would be more time to devote to it. if you compare how trump and clinton were treated at the fair to scott walker who arrived here just a few minutes ago, he snuck in the back way, went right to the soapbox. he did have a couple well-wishers come up to him, but nothing like what we experienced on saturday. he's dropped a little bit in those polls since death baithe . he had been on top here in iowa. i asked him what's been happening since donald trump has risen in those polls. >> there is a sentiment of frustration with washington and the leadership there, and i think it's a protest. they're saying they're sick and tired of politicians saying one thing and doing something different. i think the bottom line is people see i ran for that very reason in 2010, and if you want to be more than just upset with washington, if you want to fix it, i'm the guy best suited to do it. >> now, walker's campaign will say he's running a strategy that's much wider than just iowa. they will say they don't call iowa a must win. they say they're looking to southern states, for example, the so-called sec primary on march 1st. but the reality is if walker doesn't do well here in iowa or really underperforms expectations, it could be a real challenge for him to break out of a 17-candidate field and continue strong into new hampshire and south carolina, tamron. >> all right, casey, thank you very much. let me bring in our "news nation" political panel for you. heather, let's just start where casey left off. scott walker sneaking in or coming through the back to head to the soapbox. when have we known a presidential candidate who wants to arrive at a big event like the iowa state fair in a back way? that seems so strange to me. has he just been caught off guard by the trump phenomenon? >> certainly a monday appearance is not as strategic as the weekend when all the action was there, trump, his helicopter. he's really dominating a lot of the discussion right now, and i think that poll that came out today, the fox news poll, was really interested in that trump is still the favorite. his negatives are high, but he's still the favorite, and walker has gone down a few notches. >> ben carson was on fox news yesterday. he was asked about the republican voters, those who are engaged right now in this notion of the non-politician really winning the summer. let me play what ben carson said. >> well, i think people are starting to recognize that the same old-same old is going to take us to the same place. and, you know, we're sort of at a precipice right now. are we going to continue down this road leading to a very bad place, or are we going to try to make a change? i think they're also looking at the lives of people who have had very significant accomplishments. >> i've watched that interview a couple times, and dr. carson is speaking in a broadway, people looking at where we're going, we're on the precipice of something. now you have donald trump talking specifics. it's going to be huge, trust me, and now he's on the down low about what he would do with immigration. the first question i ask, how is this possible? how is this man ever going to keep this promise? as a candidate, and let's say he goes on to get the nomination, to deport, what is it, 11, 14 million people? >> which is relatively the size of the population of ohio. not only that, these 11 million people, about 62% of them have been here more than ten years, so you're talking about people with very deep ties to their community. it's very practical, i would say, at best and inhumane at worst. you have to figure how to pay for this. there is a conservative group that's estimated if we were to deport all the undocumented people who are here, it would cost between 400 and 600 billion and would take like 20 years. these are very impractical solutions, also where he says he wants to revise the constitution and uphold the law on birthright citizenship. >> he talked about mexico and, really, in a sense, tariffs and taxes and taking wages, which we're not clear which wages he was referring to as far as the wages that are being brought in through illegal immigration and people being exploited in the workplace, and i'm curious, how long can trump go on without focusing in on businesses that exploit illegal immigrants in this country? hotel industry, the restaurant industry, industries that he's a part of, quite honestly, and he's not brought out these businesses who bring in these people and exploit their work. >> right, the e-verify section of that six-page policy issued sunday was very brief. we know that he has depended on immigrant labor for his own business prospects, so there's issues there. but yeah, i think this was a start, so we have six pages from donald trump after these more bombastic statements from him, but the other candidates will be responding to him. he's going to have to offer more specifics, including business and his business dealings. and i think that will happen soon. >> how delicate of a balance at least in the primary is it for them to respond? we saw what happened to rick perry in the past, we've seen what happened to jeb bush when they offer up a softer, less hard line response to immigration. >> i asked his campaign manager yesterday about budget and specifics, how much is this going to cost, and they said basically the policy is the policy, and anyone who wants to attack it, they're attacking the front runner who has the most aggressive solid immigration plan. at this point, i don't think they're really ready to get into the weeds, but this is the first step so we'll have to see. >> i think that's the problem of all the other candidates. by him staking out these positions, they're all going to have to answer. well, do you support mass deportations? that puts him again in the conundrum of being in the conservative base and the latinos may be further down in the election. for better or worse, trump is serving all these candidates saying where he stands, and do they engage with him? because if they disagree with him, he's going to fire back and call them a loseer ar and go on about his rhetoric. >> the list goes on and on, but i do want to take our audience to the breaking news we've been following since the top of the hour. at least three people are dead and a dozen injured after a bomb blast in downtown bangkok, thailand today. joining me on the phone is global coast contributor. what can you tell us you're seeing on the scene? >> reporter: the number injured has gone up to about eight people injured, so we might expect that to rise, that's not clear yet, but it does seem to be something that could get worse over time. from where we're standing, we can see the firefighters here. so we can see where the bombing happened and on the ground. but since then, we've been looking further back, because they're wondering if there are more bombs. two more bombs were found and the search area has been widened by about another area. >> can you describe specifically the scene where this bomb or bombs went off? we're hearing it's a popular tourist area. many foreigners would gather and kind of learn about the city in that area. what can you tell us? >> reporter: it's a very popular area. it's not just popular among tourists, it's also popular among the locals. that's because you pass a very famous shrine in bangkok, and very few people need it. people come to bangkok from all over the world to go shopping there, so it's both commercial -- two commercial and cultural areas. we're hearing that people are asking for language interpreters and they're also asking for foreign language interpreters because a lot of those injured are foreigners. they're especially looking for chinese chinese law enforcement. >> can you tell us whether there is heightened security or a possible attack of some sort in this tourist area? >> they came out of nowhere. i don't think anyone has the feeling there might be something else. howev however, the threat of the bomb blast would be two malls. in the past, the target were political areas. there was a protest a few years ago. there have been attacks on one of these malls. so there is the feeling that this affects all areas, but at the moment we don't know. >> on the ground for us in bangkok, thailand. again, as many as 12 possibly killed in this deadly bomb attack. we're working to verify that number, but we do know dozens injured in this blast. we'll keep you up to date on breaking news coming out of bangkok, thailand. meanwhile, the investigation of her step-granddaughter. she was stabbed to death near her home. what witnesses say happened there. the ceo of amazon defending his company following a blistering report in the "new york times." a back-stabbing article that leaves employees in tears. why critics say delta airlines are shaming passengers into spending more money. this morning's response from delta. and you can join our conversation on line. you can find the team on twitter, and you can find me on twitter and instagram as well as facebook. we'll be right back. with a omy new jansport backpack, a powerful new dell 2-in-1 laptop, and durable new stellar notebooks, so you're walking the halls with varsity level swagger. that's what we call that new gear feeling. you left this on the bus... get it at the place with the experts to get you the right gear. office depot officemax. gear up for school. gear up for great. ♪ [ female announcer ] everything kids touch at school sticks with them. make sure the germs they bring home don't stick around. use clorox disinfecting products. you handle life; clorox handles the germs. you handle life; pubut to get from thed yoold way tohe new,d. you'll need the ght it infrastructure. from a partner who knows how to make your hp helps business move one, all the possibilities of today. and stay ready for everything that is still to come. 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