We are not engaged here in demagoguery, racist attacks, outrageous attacks against mexicans. Reporter now trump faces competition from dr. Ben carson, now tying trump along likely iowa caucus goers in a new poll. Closely watching clintons email troubles, joe biden. Hes considering a race and if he decides to give it his all despite the tragic death of his son beau. And this may be a season where his attributes are matched with the times. Thank you so much. Lets turn to chuck todd, moderator of meet the press. Good morning. Good morning. Taking this email controversy, the central accusation, what people are worried about is did she mishandle classified information . With this latest batch of 7,000 plus emails is there a smoking gun on the issue . Theres not the whole word. What does she know. Whether she knowingly passed around classified information. There is no evidence to suggest that story doesnt hold up. Remember, these are emails she chose to release. These are still emails she chose to release and gave the state department. So theres that caveat. While she may be out of legal jeopardy as far as this release is concerned there is still a political aspect. The most damning email is the one from huma that says, hey, i. T. Didnt know they had your email in here. She couldnt get email at the time. She said they didnt know about your private email setup. How was it more convenient to have your own system . Who has i. T. At home . Isnt it easier to get your email via work . I think that excuse is the one thats the least believable. The most logical explanation is she was trying to get out of congressional information and freedom of information act. Clinton campaign is saying this is a mediadriven, partisan story from republicans who want to do damage to her, prevent her from becoming president. Do you now see evidence inside the campaign they view this as a problem . They do now. They know they have a perception problem with democrat elites. Members of Congress Want to help them and they tonight dont know how. They feel the campaign isnt giving them explanations they need. There is internal friction, some led by president clinton who is annoyed there arent more surrogates out there defending hillary clinton. You will see an attempt by the campaign to appease nervous democrats. Lets jump to the republican side. Andrea pointed out a poll, likely Iowa Republican caucus goers. Donald trump is on top but now tied by ben carson. Are we talking about ben carson enough . We are not. The Des Moines Register poll and this is the second in a row thats shown carson surging. Hes leading among the most christian conservatives. Iowa. They won thanks to evangelical huckabee and santorum. Ben carson appeals more to evangelicals than anybody else. An outsider and appealing to evangelicals. Combine that, it might be an Unstoppable Force in iowa, even with donald trump. Take donald trump out of the equation and carson might be more powerful. Lets see how he handles his moment in the sun. Lets talk about jeb bush. Seems hes been much more aggressive, going on offense against donald trump. Does it make sense for him that the trump voters would never be his voters no matter what. Looking strong and going after trump may please his base, the establishment. His theory is this. The campaign, 30 for trump, lets say. And he has 100 name i. D. , 70 of republicans know him and dont want anything to do with donald trump. Thats his strategy. The problem is donald trump doesnt play by ordinary rules. When you pick a fight, he can pick one back. Chuck todd, thank you very much. Lots to chew over. Thanks, chuck. Meantime, investigators in phoenix are trying to figure out if they have a serial sniper after a string of shootings on the same interstate. Heres nbcs joe fryer. Reporter the search is on after the state patrol says four vehicles were shot within 48 hours, all along a single stretch of interstate 10 in phoenix. Next thing i know, i hear a loud bang. Didnt think anything of it. Reporter when Robert Mcdonald stopped for a coke he noticed something unusually on the tour bus. I did a walk around, and said thats a bullet hole. Reporter the bullet pierced the seats which were empty. The wind was knock out of me. Reporter gunfire hit an suv shattering the windshield and passenger window. The involved parties advising their window was possibly shot at. Reporter a 13yearold girl suffered a cut to her right ear. Incredibly we have one injury, minor, treated on scene by the fire department. Reporter the first two shootings started saturday morning, the third saturday night and the fourth monday morning. All took place within an eightmile stretch of i10. Investigators say they are trying to figure out if the same gunman is responsible for all four. This as authorities in Northern Colorado investigate a string of fatal road it is side shootings this year. Monday a semi truck driver was injured when his front windshield shattered. It is unclear if a bullet is to blame. In arizona, victims are nervous. When someone is taking potshots at you for doing your job, minding your own business, we definitely have a problem. Reporter the only solution is a quick arrest. For today, joe fryer, nbc news. Well keep an eye on that one. Meantime, the weather is a big story. Another day of heat for a large part of the country. Al has the first look at the forecast. Good morning. Good morning, guys. Of course, it has been brutally hot. Giving you an idea of how hot its been for august, we are seeing temperatures more like june and july. For august, 801 High Temperature records broken through last week of august. In fact, phoenix, they are looking at the hottest august ever since they have been keeping records. Average high 95. 2. They break the record set back in 2014. We have had a very hot august. New york city, third warmest august ever. We continue on up to the north. Bridgeport, connecticut, second warmest august. As we move to the north, burlington, third warmest august ever and starting september the same way. Dominating, humid air. As you look at the northeast well set up for a hoi. Philadelphia, washington, d. C. Heat wave three days or more in a row of 90 degrees plus. We move into the midwest. You are looking at heat wave conditions, st. Louis, kansas city, minneapolis, into memphis. It continues further west as well. Bismarck, omaha, wichita, denver. It will be hotter in denver than in miami. The heat is on. We get a little bit of a cooldown into the labor day weekend. In the meantime, temperatures stay hot. Okay. I guess the weather didnt hear its september. All right, al, thank you. Its hot when als suit matches the map. Got the orange thing happening. Well see you in a minute, al. Natalie has a strange story from georgia overnight. This was bizarre out of atlanta. Police officer near atlanta shot on monday after Police Responded to a burglary call at the wrong house. Officials say when the officers arrived they entered through an unlocked rear door. Shots fired. Both the officer and the homeowner were hit. The officer is now in Critical Condition t. Homeowners dog was killed. Turns out the officers only had a vague description of the location and not the actual trace. An investigation now under way. When a Kentucky Council clerk arrived to work shell have to decide whether to begin issuing marriage licenses to samesex couples or be fined or arrested. The Supreme Court rejected an appeal from kim davis who argued issuing marriage licenses to samesex couples goes against her religion. President obama is warning that the moment is almost upon us when it would be too late to address global warming. The president kicked off the glacier conference in anchorage, alaska, by challenging World Leaders to act boldly on the issue of climate change. He said no nation is moving fast enough to trace the problem. President obamas threeday trip to alaska will include viewing melting glaciers and talking to fishermen whose livelihood is affected by climate change. Police are looking for burglars after a smash and grab near chicago. Surveillance cameras captured the moment when an suv slammed through the front of a Clothing Store in lansing. Once the car is inside the people jump out, wave in their street. The store owner says the six burglars were in and out of the store in two minutes. The thieves took more than 70 pairs of expensive blue jeans that cost up to 200 a pair. Competitors were on a slippery slope monday during the annual festival in malta. The 33foot pole is slathered with grease. Oh its at a precarious angle. The aim of the game is to run as far as up the pole and try to remove the flag to win a prize. As you see. He got it yeah. Good one. The style in which you fall off the pole seems more important than reaching the flag. Belly flop. And a lot of speedos. I could watch that all day. My eyes are burning. We know what youre doing this afternoon. Yes. Refresh, refresh. Just another tuesday for me. Check this out. Lets go to phoenix, arizona. Man, did they get dumped on yesterday. A massive area of rain. We are talking lots of it. Flooding conditions. Even damage at the airport. Thats how bad it was. Look at the lightning. Incredible. We have more of the same today. Tropical moisture making it up from mexico into the southwest. Well have scattered showers and thunderstorms today. Some monsoonal and some heavier afternoon. Generally half an inch but could be one to two inches in local heavy you re unpacking already . Yeah, help me find some mugs. Sure. beep hey. They wake up to the mountain grown aroma of folgers. The best part of wakin up so, where do you want to start . I think this is a pretty good place. Is folgers in your cup its another warm morning out there, 77 degrees. And same in newark. And we will warm into the 80s and then near 90 this afternoon with a full day of sunshine. And forecasting a high of 90 degrees. Tomorrow, upper 80s to near 90. And 93 though on thursday, that could be the hottest day and then much more comfortable in time interest the for the holiday weekend. Video of cat phishing that you will not believe. All right, al. Thank you. Now to a gold rush in poland in the wake of the reported discovery of a long lost train from world war 12 ii loaded with riches. As nbcs keir simmons explains, police and fire investigators are headed there. Good morning. Reporter thats right. This area of western poland is already in a lockdown as officials try to establish whether there is a train packed with gold there. It may be too late. There is already Something Like a modern day gold rush under way and the fear that is the decadesold mystery has gone up in smoke. This morning in poland reports of a fire near this Railroad Track where Treasure Hunters claim they have found hidden gold in train cars. Rush. Reporter having seen ground radar images, there is no doubt it is an armored train over 300 feet long, perhaps like this one. During the tying days of the Second World War the nazis are said to have hidden the train rumored to be full of gold, gems and weapons in a maze of tunnels. It could be here. Reporter one expert says even the priceless amber room could be there, considered by some to be the 8th wonder of the world, stolen by the germans. A replica was reconstructed in 2003 in st. Petersburg. It is so beautiful. Dazzling actually. Its like a box of jewelry. Reporter treasure rumored to be worth millions, maybe more and, erhaps buried here. As we were filming a fast train approaches. Reports say one treasure hunter was almost hit, taking a seseie. Now officials cordoned the area off for peoples safety. Earlier this year i joined a bunch of these Treasure Hunters looking for the amber room in germany, savannah. They are a little bit eccentric and now a Regional Governor says the evidence provided doesnt show this train necessarily will be packed with gold. Maybe early to pack your pick axe and heat this way. Thanks for the heads up, keir. Coming up, the mysterious disappearance of mal. Ysia flight mh370 after debris was discovered. Why are there more questions than answer . And are you tired of ads popping up . How to block them and why it may not be a good thing. First, this is today on nbc. Coming up, our special series, free money. The one thing you can do now to save thousands on your student loan payments. And is scandal a good thing . Why Ashley Madison claims its business has never been better. Yes, in the wake of all the personal records being released. 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From roller coaster hills. To musical streets and movie chase scenes. Its all one road. Everywhere you take it tells your story. And wherever you are, is where the road begins. The camry. Toyota. Lets go places. Eastbound out by 62, watch out for an accident there. Starting out in the 70s. 77 in central park. And 90 today. And that would make it three in a row. Thursday could be the hottest at 93. And we hold on to the sunshine just in time for the holiday weekend. And one step that could help you save 7 30 on tuday, the 1st of september, 2015. Top of the rock, new york city looking good on this 1st of september. Meantime, closer to land our plaza is gearing up for hit music from maddie and tae. Great couple of girls with beautiful harmonies. Sound a lot better than natalie and i think we found on friday night after a couple of inks. Hey, were girls in a country song. They were with us. They have exploded. I love their new song well hear later. Well hear from them in a little bit. Severe thunderstorms rolled through phoenix overnight causing major damage. Nearly two inches of rain led to widespread street flooding. All take offs and landings were stopped for 90 minutes. L the state Department Released 7,000 more pnees of Hillary Clintonsime as secretary of state. Roughly 150 of the emails contain information thats now deemed classi ed, although they were not designated that way at the time they were sent. A funeral will be held today for adam ward, the 27yearold photo journalist shot and killed along with reporter Alison Parker on Live Television in virginia last week. More than 1,000 people attended a Memorial Service for ward last night. Now to the ongoing mystery surrounding the disappearance of Malaysia Airlines flight 370. Officials claimed a piece of wing found last month was, in fact, from that illfated flight. Why havent investigators confirmed it yet . Bill neely is on the story. Good morning. Reporter g td morning, savannah. It is one of the worlds great unsolved mysteries, but we thought the debris would solve it. The silence from french vestigators since then l d to some reports that they wont be able to prove the debris is from the missing plane and that the evidence trail has reached a dead end. Amid the painstaking search for answers doubtsnd for some families, despair. When French Police lifted aionrcraft debris fron an indian ocean beach it seemed the mystery of mh370 had lifted, too. The plane had disappeared without a trace but a trace had been found, it seemed. But one month on french investigators cant confirm the debris is from the plane. Why . Because a piece of it is missing. No one disputes the debris is from a boeing 777 and it is clear it is a wing flap. Whats missing is a metal data plate whose serial number would tie it to 370. They are never going to find that. They have to find other ways to match this part to mh370. Reporter so far only malaysias Prime Minister has said the debris s from mh370. It is indeed from mh370. Reporter french prosecutors wont go that far, simply saying there is a very strong likelihood its from the missing plane. A month on, the cautious french are still testing the part at their military lab. The prosecutor has yet to issue an update on findings. But officials from boeing, theo u. S. , australia, and malaysia are confident that circumstantial evidence pointing to mh370 is overwhelming. There is no other logical explanation as to how a flaperon could be in that part of the world in the ocean and it is apparent its been floating for some period of time for all the balernacle growth. Reporter caught amid this, the relatives of the 239 people on board. Still grieving, more than 17 months on. Still uncertain as the world waits for conclusive proof. And this morning a spokesman for the families of the chinese passengers on board has told nbc news hes surprised and confused by delays