one, to realize our brother had been shot and we almost lost him, but to realize what he did, how he stepped in without even giving it a thought. we couldn't be more proud. >> nbc's claudio is here with the latest, and claudio, as we await this news conference, by french law prosecutors have until today to decide whether to charge this individual with an attempted terror attack or request an extension to continue to hold him in police custody, and they may perhaps even give us more details on his background. >> reporter: that's what we are expecting, tamron, a man, a suspect can be detained here for four days without charges. those four days expire in about an hour from now. i'm looking at the live feed of the press conference. it hasn't started yet but we do expect some charges to be brought against him. certainly there will be charges of attempted murder of mark mugalian because the gunman shot mugalian in the back as we learned if family and friends and those interviews. but will he also be charged with planning and trying to execute a terrorism act? we'll have to wait and see. in the meantime, the two servicemen are still in the u.s. air base. stone is receiving further medical treatment in a medical facility nearby, and the third american, an american student, he tried to leave as a hero and a star. he appeared at the premiere of "straight outta compton" and he told the news that he still can't believe he's being treated as a star. in the meantime, we are learning more details about mark mugalian, the fourth american. now we understand the american originally from virginia has been living here in france for about 20 or 25 years. he's married to a french woman, he teaches english at several universities here. he tried to stop the gunman. when he saw him leave the toilet with an ak-47 in his arms, he wrestled the gun from the gunman. he turned to the passengers and said, run for your lives, but he didn't know the gunman had another pistol and was shot in the back. he's recovering in a hospital and we hope for a full recovery, tamron. >> thank you very much, and we'll bring you the latest from this news conference as soon as it begins in france. turning now to politics at home, white house press secretary josh ernest comments about vice president joe biden's possible run for president. it's stirring the political pot a lot this morning as president obama and joe biden held their weekly lunch yesterday, ernest was asked how the president would deal with it if his vice president ran against his former secretary of state. >> he has indicated his view, that the decision that he made, i guess, seven years ago now, to add joe biden to the ticket as his running mate was the smartest decision he had ever made in politics. and i think that should give you some sense of the president's view of vice president biden's aptitude for the top job. >> meanwhile, there is a report today that president obama gave biden his, quote, blessing to run at their lunch yesterday. nbc's peter alexander joins us live now from the white house. obviously, peter, when you have the press secretary saying some very strong, i guess, words of support for joe biden, many people wonder what was happening in that luncheon. >> reporter: that's exactly right, but josh ernest, you were just talking about it, he credited the vice president for his counsel, his leadership, everything he's done for the president. they said the vice president has earned the right to take all the time he needs to consider a 2016 run. president obama gave biden, as you described it, his blessing in the weekly lunch they share. he basically said go for it if you want to run. sources are speculating about something they know nothing about. this morning the buzz about a possible biden bid is building, the latest link that the vice president will huddle with possible donors after labor day, adding to the buzz of the not so secret lunch. who will the president back? his vice president or his former secretary of state? secretary josh ernest says the president respects and honors hillary clinton, but heaps praise on biden. >> there is probably no one else in american politics today that has a better understanding of what is required to mount a successful, national presidential campaign. >> reporter: later earn s addrn to the intrigue. >> i wouldn't rule out the endorsement of a primary. >> secretary of state hillary clinton pushed for mo more aggressive actions in afghanistan, libya and syria. biden was more cautious. the biggest split is that clinton pushed forward, but biden initially thought it was too big of a gamble. >> if they did get in the race together, you could see this being a defining point on presidential judgment. >> those messages disappear all by themselves. >> meanwhile, republicans aren't letting up on clinton. still, clinton is not backing down, picking up the pace of her campaign leaving her hamptons vacation tomorrow for a swim through the midwest. first stop, iowa. biden reportedly met with two of obama's most trusted advisers at his residence last night. here's a piece of good news for the vice president. only a small percentage of obama's furndraisers in 2012 hae already committed to bund ling that money for the clinton campaign. >> obviously that's good news for joe biden, not for the clinton campaign. jeb bush is holding a town hall in englewood, colorado focusing on his plan to help american veterans. it comes a day after his visit to the texas-mexico border where he topped off a new war of words with republican front runner donald trump. speaking in both english and spanish, bush blasted trump's immigration plan, which includes sending 11 million illegal citizens and revoking their right to citizenship. >> it will cost hundreds of millions of dollars, it will violate civil liberties, it will create friction with a trading partner that's not necessary, and i think he's wrong about this. [ speaking spanish ] >> in response to that, trump retweeted a twitter comment saying, quote, jeb bush is crazy. who cares that he speaks mexican? this is america. english, end quote. meanwhile, jeb bush's campaign released a web video of analysts criticizing trump's plan while bush entered an interview about jeb bush's mother. >> would you like to see him run? >> no, i really don't. it's a great country, there's a loft great families. there are other people out there that are very qualified and we've had enough bushes. >> nbc's katie tur is in dubuque, iowa. how many people are they expecting? >> they're expecting hundreds. we'll probably see an overflow room as well. wherever he goes, he draws the crowds, tamron. >> we saw that to be the case in alabama on friday. he's also drawn, obviously, the anger of the bush campaign, specifically regarding immigration and some of the, i guess, hostile tone of it now, katie, with donald trump's team or trump himself retweeting the comment that who cares if he speaks mexican, this is america, this is getting, i think, past personal at this point with these two men laser focused on one another despite the more than dozen candidates in the race. >> yeah, he's been on a bit of a twitter tirade for the past 24 hours. first last night he was saying that t"the kelly file" was bettr without meghan kelly, then the asian baby comments, and retweeting that mexican comment, of course, it's speaking spanish, not speaking mexican. getting into another fight with lindsey graham, congratulating him with getting four points in north carolina, but saying he's still 26 points behind him, donald trump. it's like bringing a stick to the sledgehammer fight with him. any time you hit trump, he comes back significantly harder, and his opponent ends up the more bloody one in this fight. he ends up losing the support. and jeb bush is seeing this right now. i think he's tried ignoring him, tried keeping him out of the fray, but reporters keep asking him about it. i think he's becoming increasingly frustrated. i'm not entirely sure that's the best practice for him, though. there is no line for trumpl where there has to be a line for other candidates. the voters and the people out there don't necessarily expect donald trump to have the same kind of commentary or politically correct words as other candidates in this race, tamron. >> let me bring in our political panel for you this morning. former chief of the u.s. office of citizenship under george w. bush also joining us, nbc political analyst david coren. thank you both for joining us. there is no line for donald trump. his campaign is based on being politically incorrect, so he can, in his mind, tweet out or retweet something offensive as he did about not speaking mexican, directed at jeb bush, his family as well. as he pointed out, my children are hispanic, my wife is hispanic, and people applaud him, many people who identify as conservatives. >> well, and that's an incredible thing. donald trump is not only hoping the immigration plan isn't conservative. how could he not be conservative? only three years ago, he was attacking mitt romney for deporting self-deportation, saying self-deportation and ma nye cal, and he should support a comprehensive approach. three years later, he's. he is the ultimate politician, and i hope that the media will look at his record and see that he's. i think jeb bush is doing the right thing by distancing himself from trump, by forcefully rebuking what he has to say. peak came out with some numbers very interesting yesterday that shows that his favorable rate has him going off. that's because they understand, they see that he understands the latino community, all the different groups within the latino community. >> even with the reference of anchor babies, and i want to play now his attempt at cleaning up. but you may see donald trump as not being a conservative. they may be but someone appears to knock jeb bush off his game, and i just want to play a little bit of what he did yesterday. >> this is ludicrous for the clinton campaign and others to suggest that somehow i'm using a derogatory term. what i was talking about was the specific case of fraud being committed where there is organized efforts, and frankly, it's more related to asian people coming into our kcountry having children in unorganized efforts, taking. nothing about what i've toward immigrants at all. oh, wait, this political correctness scolding. >> that's a donald trump line. are you okay with this, alfonso? >> i understand what he's saying. i don't like the term anchor baby, i think it's offensive, but in the end, the voters aren't dumb. they're going to base on a candidate based on ideas and substance. he may have used at one point that term. it was clear that's not the term he normally uses, but they know where he stands on immigration, that he favors immigration reform. hillary was the one r repatriating. i think this has been way overblown, voters scared about the eegss. good ahead. >> i feel alfonso's pain and jeb bush's pain as well, because the question isn't who is a conservative and who is not a conservative. 25% to 35% of the republican voting base doesn't care. they don't care whether donald trump is a conservative or not, what they care about is anger. and essex plohe is exploiting t on the right about the cultural changes in america, politicians rating the game in favor of politicians, so they're not looking at it as a liberal versus conservative, who is venting my way, who is expressing my ang or. there's more that jeb bush is getting. he wants to say it's not a big deal if you do use it, then he tried refining the term to asians, not hispanics. why? because he's trying to keep up with donald trump orthopedic respond some way. they just can't say something straight out. he's kind of limited because he knows if this gets out there and just sort of says donald trump is full of you know what, he's going to have a hard time getting some of those voters which he will need in either the primary or the general election. so he's cornered. >> let me switch to joe biden and how there is this potential battle that people are openly and donald trump. he writes, the great potential strength of a joe biden presidential campaign can be summed up in one way. biden is what trump pretends to be, a garrulous, blunt speaking guy. >> it seems to me he's very interested and in talking with people who have worked with him over the years, that's not a surprise. as has been reported widely, there are a lot of concerns from a family perspective. his family is still reeling from the tragic loss of his son beau. there is an age issue, there is a getting in late issue that is creating a money issue. there is a lot for him to overcome to get in there. plus i think, you know, he has a legacy now as an elder statesman with the democratic party. he's done a lot of his decades in public service, and if he gets in this race with hillary, it could become quite nasty. bernie sanders is running explicitly. i think if it's biden versus hillary clinton, it's going to have to get somewhat personal, and i think each side will have a hard time not destroying the other side, and that will look bad for both. i think this is a very fraut situation for both of them. developing now, the dow bounces back following its historic plunge. will stocks continue to rebound today? you see the numbers are up, 400. we'll go to cnbc and get a live update. far different picture than we saw yesterday. just received an update on tropical storm erika. it could hit florida in a few days as a hurricane. it's one of the stories we're updating around the "news nation." the team is @newsnation on twitter. you can find me on it's quite alright... you know what? we want to make a deal with you. we're twins, so could you give us two for the price of one? come on, give us a deal. look at how old i am. do you come here often? he 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addition, i think the market was a little bit oversold in yesterday's trading session, and a number of the big institutionalal in vervestors a picking up shares of bank america. this is the sharpest rally we've seen all years in the industrial average. so expect this volatility to continue as we go into the fall. we still don't know whether the feds will hike interest rates. tlar number of very influential analysts on the street who are calling for them to actually cut interest rates again given the vo volatility in the stock market. back to you. >> a different perspective on it. we'll talk to you tomorrow. coming up, well-liked indy car driver justin wilson dies one day after being hit by debris during a race. mario andretti said the dangerous sport is as safe as it could possibly be. the very latest on this investigation and concerns of safety for the drivers. plus this -- >> the perception that was there going in was this was not a working environment. >> the punishment for these 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