negative way. cnn will host the first democratic presidential debate october 13th. mark your calendars, in nevada. you can always follow us on twitter. erin burnett out front starts right now. >> breaking news. the pope has landed. the president and mrs. obama, the vice president and mrs. biden. all on hand to personally welcome the pope to the united states as he begins this historic six-day visit. >> also unparalleled, the massive security operation surrounding the pope. said to be one of the most intense security environments in american history. >> ben carson shifting statements on the question of electing a muslim president. many fellow republicans say he's wrong. so can his campaign recover? let's go "out front."

good evening, i'm kate bolduan in for erin burnett. pope francis in america. the people's pope landing at joint base andrews outside washington just a short time ago. for an historic six-day, three-city visit. his first to the united states. president obama and the first lady along with their daughters, the vice president and mrs. biden were on hand to greet the pontiff along with a big crowd. some 300 local school children included. the crowd chanting, "we love francis." at times the pope departed andrews in not your typical vip car service. instead a tiny fiat. his vehicle simply dwarfed by the suvs that took the presidential contingent back to washington. tomorrow, 15,000 people will gather for his welcome to the white house. thursday, the pope will address a joint session of congress before flying to new york city for a prayer service at st.

patrick's cathedral. on friday, the pope will speak before the united nation's general assembly. this weekend, he'll deliver mass in philadelphia before a crowd that could reach 1 million people. homeland security is calling the pope's trip a national security special event. government officials say the visit will be one of the largest security operations in american history. jim, you were there as the pope arrived. what was it like when the pope stepped off that plane? >> reporter: unprecedented on so many different levels. that's not an exaggeration. it's a fact. unprecedented to have a president and vice president greet a world leader as he arrives in the u.s. unprecedented because this is the first visit by the 78-year-old pope. unprecedented, the security response here. thousands working to keep this pope safe on this visit.

one of the largest security operations in the country's history. finally as well, unprecedented in style. how did i know that? because in addition to all those luminaries the president, the vice president, the archbishop of washington, the governor of virginia, the mayor of washington, you had several hundred kids here and a high school band. what was that band playing just before the leader of the catholic church landed in the u.s.? they were playing songs from "louis, louis" to ferrell to neil diamond songs. >> i can't get enough of it. the pope and the fiat. what is behind that unexpected choice? >> reporter: it's incredible. you saw his motorcade line up. you saw the typical cop cars and

police motorcycles. it was only at the end when we saw this little car pull up where the pope was going to hop in it. i saw the license plate and it had cv 1 which means vatican city one. only he can drive that car. this is a pope of gestures. that was a gesture with two messages. one, he comes from italy. his italian background, got to drive a little italian fiat. also this is a pope of the people. he doesn't want to drive in a cadillac limo or big gmc suv. he wants to drive that little car down the streets of washington, d.c. one of many gestures we'll see. one more tonight, a quiet first night for the pope in the u.s. it's yom kippur the jewish holiday, no public events scheduled. he is not jewish but an ecumenical church leader.

>> jim, great to see you. amazing moment to witness. thanks so much. rosa flores flew with pope francis from cuba to the united states. she was on that plane and joins us now. you had many amazing moments on that flight. during the flight, the pope, one of the things the pope did was took questions from reporters on the plane. at one moment he gave a bit of a hint as to what he will or won't be bringing up in his very highly anticipated address to congress. >> reporter: i think the world is waiting to see what pope francis says before congress. he did give us a hint. we asked him if he was going to talk about the embargo. he said no, he was not going to speak about the embargo during his speech but he would probably, he said, speak about multilateral and bilateral agreements. he said that is a sign of

progress and co-existence. now we've been trying to get hints from the pope throughout this trip, kate. since we left rome and a couple of others things he mentioned along the way, specifically when we flew from rome to havana. he mentioned the word "peace." a lot. he mentioned there were wars in the world and there were immigration issues. of course, that reminds us of the anti-immigration rhetoric we've been hearing here in the united states. will he mention that? we don't know, of course. i think it's a clear hint he might be addressing immigration. >> fascinating stuff. everyone waiting for that moment. rosa, great to see you. with his arrival, pope francis begins a six-day visit marked by many historic firsts. including the first papal address to a joint session of congress. jim acosta is out front. >> reporter: it was would be of

the biggest symbolic moments of the obama presidency, with the president and first family plus the first catholic vice president and dr. jill biden greeting pope francis. it made for an unprecedented welcome to the u.s. >> it is a big deal. i think it's because since it is the pope's first time in the united states, what better way to welcome him than greet him as soon as he touches the ground here in the united states? >> reporter: day two will be a sight to behold. 15,000 visitors are expected to cram on to the white house south lawn to witness the pope's official arrival. after the president greets the pope, the two leaders will speak to the world then hold a one-on-one meeting with only translators in the room. all before pope francis addresses congress thursday with biden in attendance. even though the president and pope are allies on issues ranging from climate change to income inequality to cuba, even the iran nuclear deal, the white house refuses to reveal what the two men will discuss. >> the president will not arrive at that meeting with a political

agenda. >> reporter: perhaps because this pope can be full of surprises. after their last meeting, we asked the president whether any hot button social issues were raised. did he register objections with you about the contraception coverage mandate in the affordable care act or referenced to advance the rights of gays and lesbians in the united states? mr. obama responded, the pope unexpectedly brought up immigration reform. >> i think he was mindful of the polite of so many immigrants who are wonderful people working hard, making contributions, many of their children are u.s. citizens, yet they still live in the shadows. >> reporter: valerie jarrett told cnn they may have more business to tackle in the final months in office. >> the work is never done. with two men of this caliber who share ideals and who share values about human decency,

respect for human differences, i think that it's going to be a really positive visit. >> reporter: besides the hard issues the president and pope my tackle from abortion to the syrian migrant crisis in europe, there will be plenty of ceremony in their encounters. the president will present the pope with a gift, but again secrecy here in the white house. no word on what mr. obama has in store. as adorable as that fiat is, i'm hearing we'll see more of the pope mobile here in washington tomorrow. >> absolutely. many looking forward to that. thank you so much. presidential historian douglas brinkley who has written extensively about the history of climb in america. great to see you. one of the big moments as jim laid out perfectly right there during this visit is the private meeting between president obama and pope francis. this isn't like any other meeting with a head of state. he's not a politician, he's the pope. what goes on in a meeting like this? >> there is nothing like it.

this is a true gold star day for president obama and vice president biden. i remember when ronald reagan had to meet pope john paul ii and he was terribly nervous. reagan had been a movie star. he said only mother teresa and the pope make me nervous. you can imagine the anticipation the president has, not just meeting the pope and talking with him but making sure his journey to america is fruitful. he is probably waiting to see what he tells congress as much as everybody else is. they have shared history with the success in cuban diplomacy together and on the same page on the climate issue. >> interesting you bring up reagan and john paul ii. they were known to have a close relationship even trading correspondence. do you see them developing a similar relationship?

>> well, although the pope is 78, he will probably be the pope for another decade or more where president obama is leaving office soon. they are meeting each other as, we forget sometimes barack obama won a nobel peace prize. the pope is an advocate for global human rights. they have a lot of natural shared common ground. they both are really intellectuals at heart. i think the president would like to see history shows a lot of his views and the pope are the same. it's hard to miss the fact barack obama has been making climate change the number one issue of his second term. here is the pope leading the charge along with him. that is something that the president recognizes there are going to be allies in the history books. >> real quick, another historic motion as this pope gig his first address to a joint session of congress. what is the message you think he wants to send making this address and what is the goal

there? >> all of america is thrilled that the pope is here. you might have one or two foolish congressmen that object or try to boycott him. in the end, i think the pope wants to talk about the message of love. may talk about the syrian situation. might mention his recent trip to cuba. might mention climate change. overall, it's about fellowship and keeping the spiritual life, the moral imperatives of the planet alive. he's coming here to spread the message of love and millions, tens of millions of american catholics like myself are very excited that he's here. >> you can see the excitement the moment he stepped off that airplane at joint base andrews. could you see the excitement in washington and off to new york and philadelphia. a very, very busy trip. douglas, great to see you. thanks so much. out front next, being called one of the biggest security operations in u.s. history. how american security forces are set to protect and planning to protect the pope. plus, the outrage over ben

carson's remarks that he couldn't support a muslim for president. the outrage won't die down. is an apology the only way to put out this fire? >> donald trump rolling out yet another reason he says he didn't correct a supporter's anti-muslim and birther remarks at a recent rally. did you know that good nutrition is critical for brain health? brain food, hmmm. ensure has b vitamins that help support brain health - now that's smart nutrition. ensure's complete balanced nutrition has 26 vitamins and minerals and 9 grams of protein. ensure. take life in.

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more breaking news tonight. pope francis is in washington, d.c. spending a quiet meeting at the vatican ambassador's residence. this is requiring an historic level of security. three major cities are on alert after washington comes new york then philadelphia. more than 6,000 officers will be on hand to protect the pontiff when he arrives in new york city thursday. 1,100 police vehicles are on stand by. authorities are even sealing up man hole covers in and around central park.

>> reporter: it happened in a split second. several people breaking from the crowd, one of them able to reach into the pope mobile in havana. the sudden security breach handled quickly by the pontiff's security detail underscores how high the stakes are and how much greater they will be when the pope arrives in new york city to address some 170 world leaders, all with security details of their own. security will be tight in the air, on the roof tops, the waterways, the city streets, all eyes zeroed in on pope francis. >> the implied threat is significant. nobody wants to have a protectee go down on their watch >> reporter: the secret service is coordinating 50 agencies in a massive operation. for a two-day period from thursday night through early saturday, pope francis will

visit six locations, all which will be swept, secured and locked down long before he arrives. >> almost like a military operation. they are going to post themselves with agents and officers and kick everybody out and sweep it for security threats. >> reporter: bill gauge is a former secret service agent who protected pope benedict on this is 2008 u.s. tour. you've still got balconies over here, roof tops, trees. what's not to say that somebody can simply hide in those areas and wait? >> each building, someone from the service is going to visit and do an assessment, do the windows open out, in or even open? how do you get on the roof? who controls roof access? there is going to be plains-clothed agents as well as nypd officers patrolling the roofs. >> reporter: the nypd will provide man power, protect the city, coordinate street closures and as in this drill, respond to potential attacks.

>> another ied explosion and 200 injured. >> they are trying to kill us, the terrorists, al qaeda, isis, islamic radicals and we need to be constantly mindful of that. >> reporter: only ticket holders are going to get close enough to st. patrick's cathedral to get a glimpse of the pope. they have to go through multiple security check points. because there are so many office buildings here and so many pedestrians, there will be a fence set up and that is to ensure nobody slips through any contraband like a weapon. >> fencing used routinely to identify that have been screened versus those that haven't been screened. >> reporter: every agency will also have its own command post with teams monitoring intelligence, social media posts and comings and goings of people on various target lists. surveillance cameras are posted throughout manhattan. radiation detectors will be positioned at bridges and

tunnels. the fbi's most recent bulletin said there is no known threat surrounding the events. cnn, new york. "out front" now, former secret service agents. there is a huge amount of security around this visit. jonathan, we've been talking about this. you say protecting pope francis is like protecting no one else. why is it so different? >> he doesn't follow the traditional model a secret service protectee has. he is a religious leader. pope francis is the nexus between the people and the church. his mission on this trip is to reach out to the people, to embrace them to get into the crowd and that poses a massive security challenge for the secret service on this trip. >> how do you account to are that?

also account for the massive amount of agencies all involved here in protect the pope from the fbi to the secret service to the coast guard to the local and state police? >> the deconfliction exercises. it is taking up a large portion of the pre-planning many now. they are planning in other cities. this pope lacks predictability. on the inauguration route when president obama was inaugurated in 2008, i was there and responsible for the zone where the president was to get out and wave. we knew that was where he would get out despite reports otherwise. you don't know that with this pope. with this pope, he could get out anywhere. you have to resource, allocate

all those special weapons teams and people in the crowd. really everywhere along the route which creates a real problem. >> we've seen problems with those trying to protect the pope in rio. the car he was in came upon traffic. they took a detour. then the car was mobbed. all well-wishers wanting to get close to the pope. how do law enforcement account for that ordeal with the situation or try to avoid a situation like that? you see the officers trying to push arms away. >> the secret service isn't going to allow this to happen. they will take these lessons learned. in cuba people came up over the barricades and got right up to the pope mobile. the secret service is contactgn

of this activity happening. they've done a real proactive advance, which is paramount to any secret service operation. surveying those routes and mitigating all those types of threats. >> the director of the secret service overseeing the welcome of the pope arriving. that seems extremely unusual by all accounts when we were all talking about it. what does that tell you? >> i've known joseph clancy a long time. i worked for him when he was at deputy special agent in charge of the president's detail. he is an exceptional human being. the joke is they used to call him father joe because there was a rumor he wanted to be a police. i'm not surprised he chose to get out of his office and to get boots on the ground, see what's going on. joe clancy is all business. if something is going to go wrong, he is going to be there

to correct it first. i'm not surprised at all he's there. >> amazing to see him there. now we know his nickname. we'll tell him you told us that, dan. it's on your head. >> i've got permission. >> thank you so much. "out front" next, ben carson changing his stance on a muslim running for president. will his shifting answers hurt him? >> donald trump, his latest defense for ignoring a supporter's anti-muslim remark. >> even after laying off 30,000 workers, carly fiorina says she is proud of her record at hewlett-packard. can she convince voters this time?

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in a new interview with "60 minutes" donald trump is responding to the growing criticism that he did not correct a supporter who said that president obama was a muslim. trump now pointing to the 9/11 attacks as reason for not taking a stand against that supporter at a recent rally. listen here. >> it was a testing moment for a man running for president. >> i don't think so.

>> you never know when they're coming. you hat a bigot that you could have slapped down. >> you don't know that. he asked a question. you don't know he was a bigot. >> a problem in this country and it's muslims? >> let me ask you this. you said is there a problem in this country and it's muslims. i love the muslims. i have many, many friends, people living in this building, muslims. they are phenomenal people. like everything else you have people where there are problems. we could say there are no problems with the muslims. there is no terrorism no anything. they didn't knock down the world trade center. to the best of my knowledge, the people that knocked down the world trade center, they didn't fly back to sweden. >> ben carson is shifting his position again on his opposition to having a muslim be president. he and his campaign team have appeared to offer several different explanations in defending and clarifying his comments. carson says he has not changed his story at all. joe johns caught up with the

candidate today in ohio. >> i don't care what a person's religious beliefs are or what their religious heritage is. >> reporter: ben carson shifting his position on whether a muslim should serve as president. >> if they embrace american values and they place our constitution at the top level above their religious beliefs, i have no problem with them. >> it's a nationalist position? >> i said that. it's on the record. on nbc. that's exactly what i said. that is exactly what i meant. >> reporter: but that isn't what carson told nbc sunday. >> if it fits within the realm of america and consistent with the constitution, i have no problem. >> do you believe that islam is consistent with the constitution? >> no, i do not. i would not advocate we put a muslim in charge of this nation.

i absolutely would not agree with that. >> reporter: telling cnn he's been consistent from the start. >> did you change your position on a muslim in the white house? >> not at all. very consistent. >> reporter: many republican presidential contenders are weighing in saying religion should not exclude anyone from serving as president. >> i don't think religion should be a criteria for being president. >> i personally do not believe your religious denomination should disqualify you serving in office. >> reporter: donald trump said many people agree with carson but would ultimately accept anyone who gets through the rigorous election process. >> proper people, properly vetted, i think anybody able to win an election will be absolutely fine. >> reporter: carly fiorina offering her view on the "tonight" show. >> i believe people of faith make better leaders. faith gives us humility and empathy and opt imisoptimism.

those are are important things. >> ben carson addressed a crowd of 4,000 people who turned out to see him here in the buckeye state. many supporters say the controversy over his comments hasn't registered on their radar. >> joe johns, thanks so much. ana navarro is a jeb bush supporter and friend of marco rubio. and katrina pearson. katrina, you are a supporter of the trump campaign. you heard right there what trump said to scott pelly on cbs. his explanation now about why he didn't slap down that supporter at that rally in new hampshire. is that a satisfactory answer to you? >> i don't know that he's changed his explanation. he is piling upon it.

people just aren't happy with the answers's giving. he is expanding upon it. the question is what is it that is the controversy because that keeps changing in the media. is it the fact he did not correct this man when he called obama a muslim or what? because the reason he says he didn't correct him is because it's not his place. if that's the issue that's causing all this trouble, we might need to go back to hillary clinton considering it was her campaign that started this in 2008. >> right after this event, his campaign manager said that the reason he didn't correct him was because he didn't hear the man. so they did change their position. >> you can look at the video and tell he is trying to listen to the man. there was a delay in the response. he completely ignored that part of the question and only answered the second part. i would like to point out that there is an also released that

this man was a plant from an anti-tea party organization that's been around for quite some time. this controversy isn't a controversy. >> i've seen that report. it's not entirely clear proven he is a plant. >> his picture has shown up on that website. >> it's not confirmed he is a plant, just that he said inflammatory things in the past. what is your take on trump? >> this entire conversation is crazy, frankly. we are having a conversation about still today in 2015 about whether barack obama is a muslim or not. i believe the man is an american. i believe he is a christian. more than that, he is about to start his last year as president after being elected twice. i think we need to leave this alone. let this issue die. then we are also talking about whether a muslim should be

elected president. there are 300 people running for president in 2016. not a single one of them that i know of is a muslim. it's not sure what the relevance of this conversation is. tonight is yom kippur. tonight the pope is in washington. can we just maybe for one minute leave this political vitriol aside? i can't believe these many years into this we are still talking about this. >> i hear you. don't you think the candidates offered up any unity when they are attacking each other. >> there is nothing i can say that will make donald trump change his mind or ben carson change his mind. i am glad my two friends running for president, marco rubio and

jeb bush have both said what i'm saying. that barack obama is a christian and american and they don't want to talk about this any more. there is much more important national issues to be talking about. >> katrina, i want to get your take. >> ana is right. >> in talking about moving forward from this moment, no matter how many different explanations or not these candidates are offering on these issues, the fact it has been brought to the focus, these situations, these candidates have brought to the focus this issue at this moment, no matter what happens in the primary, how do you think this is going to play in a general? do you fear this hurts the republican party in a general election, the fact this has become such a focus? >> cnn's own poll shows the public doesn't believe president

obama is a christian. they gave their answers honestly. i agree with ana. >> that's a first. >> i was going to say. that maybe the first. maybe not the last time you two have agreed. the unity you were looking for just occurred right here. >> i'm all about the pope. love and peace right now, okay? >> thanks very much. "out front" next, carly fiorina say her business record cost her a senate seat five years ago. can she defend that same record as she is running now for president? >> breaking news, that drug company ceo who hiked the price of a life-saving drug by 5,000% now is saying something new. he is going to make it more affordable. what does that mean? the promise of the cloud is that every organization has unlimited access to information, no matter where they are. the microsoft cloud gives our team the power to instantly deliver critical information to people,

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polls. tonight, telling supporters that she stands by her record during a time the company faced heavy lay-offs and losses. listen. >> i'm not concerned at all. i'm happy to defend my past business record. i will run on that record all day long. i think it's important that people understand what someone's track record of leadership is. i'm happy to have that conversation. >> that stepped-up defense is coming as donald trump continues to try to knock her out calling her a disaster, among other things. "out front" is martin wilson, former campaign manager for carly fiorina's senate bid in 2010. in 2010, fiorina was essentially tied with senator barbara boxer. boxer released this attack ad that most folks say sank her candidacy after that. it was all about her record as

ceo. what is going to be different this time, do you think? >> i think one of the key differences is that ad certainly had an effect along with some other atmospherics we face in california. fundamental fundamentally, this is a deep blue state. barbara boxer attacked carly fiorina. we attacked boxer. there are more democrats in this state than republicans. carly ran a good race, a competitive race. at the end we got overwhelmed by democratic turnout in a handful of counties in california that gave box their margin of victory. >> when you compare a senate race and obviously a presidential race, when you talk about attack ads, it's going to be in multiples more she could face. don't you think the attacks are only going to get worse now that she is running for president? >> well, she is running for

president in republican primaries. her opponents, she had a competitive primary and won by a substantial margin. those attacks were tried in the primary among republican voters and they largely fell on deaf ears. >> let me ask you, when you look at some of the things, this is what the folks attacking her will point out. donald trump will point it out, all the other candidates will point out, profits, profits, revenue declined 40% during her six years at ceo. stock price fell 45%, nasdaq fell 23% as a point of comparison. other tech companies struggled, but hp underperformed. what is your advice if you were advising her campaign how to take it on when her record is everything she runs on? >> again, i think she is perfectly capable of defending her record. remember, these charges when they happen to a candidate, they

don't happen in a vacuum. people are going to judge her record against what they know about donald trump. carly fiorina saved a company. donald trump bankrupt four. i think that's quite a stark difference. >> we'll see those fights only get rougher. she is in donald trump's sights now. that proves she is surging in the polls and nipping at his heels. >> yes, she is. >> thanks very much. next, breaking news after outrage exploded over how this man's company bought a life-saving drug and raised the price 5,000%. now he appears to be backing down. got the latest. can a business have a mind? a subconscious. a knack for predicting the future. reflexes faster than the speed of thought. can a business have a spirit? can a business have a soul?

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16 grams of protein and 23 vitamins and minerals. all in 160 calories. ensure. take life in. breaking news. a pharmaceutical company ceo is backing down after increasing the price of a life-saving drug from $13 to $750 a pill. jason carroll is "out front." >> reporter: he's brash, a multimillionaire and taking a lot of heat for that decision to raise the price of a drug to treat cancer and aids patients more than 5,000%. now martin shrelli is backing down. >> we agreed to lower the price to more affordable and able to allow the company to make a profit, but a very small profit and we think these changes will be welcomed. >> reporter: the drug in question is called daraprim used

to treat a deadly parasitic infection. it used to cost 13.50 per pill. turing changed the cost to $750 a pill. hillary clinton blasted that rate hike this >> that's produce gouging pure and simple. >> reporter: the hiv medicine association sent a joint letter calling the increase unjustifiable for the medically vulnerable patient population. in a previous interview with cbs news, screlly called the increase an altruistic move that would have helped fund research. >> with these new profits we can spend all of that upside on these patients who sorely need a new drug in my opinion. >> reporter: the 32-year-old not new to controversy. in 2013 while serving as ceo of the biopharmaceutical company, retrofin, he allegedly harassed an employee writing in a letter shown in this court document, "i

hope to see you and your four children homeless and will do whatever i can to assure this." last month retrophin sued him for $65 million saying he used his control over retrophin to enrich himself. he called the allegations baseless then went to twitter quoting a hip hop group posting "i am not the one to [ bleep ] with." >> it's hard to believe that somebody can be so driven by greed. >> reporter: the spokesman for an organization called the citizens for responsibility and epics in washington has been critical of him for years. >> i'm not surprised by it. he's somebody who seems to be willing to play a fast and loose with the rules, take advantage of the system and is really driven by his own profit over everything else. >> reporter: so while the controversial ceo made it very clear he has heard the public outcry, what he did not make clear is how much he would end

up reducing the cost and brianna, he also did not say when the public would see the reduction in cost. >> all right, jason carroll, thanks very much. "out front" with me now, dr. sanjay gupta, cnn's chief medical correspondent. sanjay, this guy did not look like he was going to be backing down then after he sparked shock and outrage over this price increase, and now he says he's going to make it more affordable so they can break even or make a small profit. what's your reaction to that? >> you know, i'm mystified and horrified at the same exact time. i don't know, you know, kate, it's interesting because we don't know what the price reduction is going to be. >> right. >> somehow he saw that 5,000% increase in price was justifiable, so we have to see what the final number is here, but still, it's a remarkable increase that he thought it would be okay, and remarkable increase for people who dramatically need this drug and don't have another option. that part of it still remains true. >> sanjay, the price hike is just pretty unbelievable, but

it's not entirely unusual this situation. he says that he thinks that they sorely need a new and better drug here. what are you hearing? >> i'm not hearing that. i mean, i know that that's his justification. he's saying that. talking to infectious disease doctors who prescribe this drug, this is a situation where you have a medication that works pretty well and beam have been clambering away for a new medication so that might be a little bit of smoke and mirrors but i tell you, kate, your second point is a good one. that is that this does happen and surprisingly, certain situations like medicare, for example, can't even negotiate with pharmaceutical companies to lower costs. so it's very tough. the patients get caught in the middle. >> see if that's going to be changing any time soon. amazing situation, though. amazing turnaround at aut. sanjay, thank you. "out front" for us next, hats off to pope francis. be right back. technology empowers us to achieve more.

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moments after walk off a plane this afternoon the pope removed his skull cap. here's jeanne moos with why. >> reporter: we tend to notice the pope's skull cap. only when it flies off. it often appears ready for liftoff. usually when he's getting off a plane, but pope francis never loses face when a holy gust gets him. he's so humble he lets kids play with the cap. known as a zucchetto. >> i thought i'm going to be on the plane with a pope, wouldn't it be cool if i swapped a zucchetto with him? >> reporter: before he boarded the plane, he went to the pope's tailor shop and bought a new

zucchetto for 58 bucks. he handed him the new cap which the pope tried on for size then -- >> grande, which means a little big. >> reporter: francis gave the cap back to the reporter. for the pope, this is a old hat. he does it all the time. fans wave a cap at him. the popemobile stops. if the cap fits, he keeps it and gives away the old one to these two boston college students, for instance. and if it doesn't fit, francis at least puts it on his head so when he returns it, it's been worn by a pope. for papal cap swappers, it's a thrill. >> i'm still shaking. it's been, like, ten minutes. >> reporter: for others the thrill is making a buck on ebay where caps said to have been worn by the pope are for sale for more than $900. but david o'reilly isn't selling his. >> it's in a ziploc bag in my back back. >> reporter: when the plane landed in cuba, the wind stole

the pope's old cap. here's a man who doesn't just preach to you about giving the clothes off your back. he gives you the hat off his head. jeanne moos, cnn, new york. >> thanks so much for joining us. "a.c. 360" starts now. good evening from a very exciting night here in washington, d.c. we're at the catholic university of america in front of the largest roman catholic church in america. it's a venue far too small for the crowds expected to see pope francis celebrate mass here tomorrow. it's a beautiful location. instead, as you can tell, it's going to happen outside. they're calling it the mass in the grass. it will be just one of when big moments in the pope's first visit to the united states. it's going to take him to new york and philadelphia as well. tonight, what he hopes to accomplish, who he's hoping to reach, how his message is being received and the backstage details, all the unprecedented