The general election matchup now set this morning. Donald trump is on the attack as the democratic ticket makes their first joint appearance today. Live on the campaign trail. Photo controversy. These adorable pictures of Prince George released for his third pirt day. One in familiar provoked outrage online. Why this is causing a meltdown today, saturday, july 23rd, 2016. Announcer from nbc news, this is today, live from studio 1a in rockefeller plaza. Good morning and welcome to today. Im Sheinelle Jones with craig melvin, stephanie and dylan dreyer. We need to reintroduce ourselves. Someone said you were having a baby. You werent here . How long has this been . No. You look great. Thanks. Well talk story. The dangerous heat wave blanketing a lot of the country. The high temperatures that gripped the middle of the country earlier this week are now moving east. Some areas could feel temperatures well above 100 this weekend. Nbcs Morgan Radford is covering the story. Good morning. Yesterday was the hottest day of the year, peaking at 94 degrees. This is the first time all the major cities across the country, new york, chicago, l. A. , have been under heat advisory at the same time. Just to give you some perspective, in those urban areas, all the concrete and the metal, it trapped that heat, making it feel hotter than it is. Reporter a deadly heat wave affecting millions of americans this morning as a dangerous cocktail of humidity and high temperatures leaves 26 states under heat advisory. Too hot. Sweating like crazy. Reporter in new york, the also in effect. People are being urged to take public transportation. The heat underground is unbearable. Its on fire. Feels like im boiling in a pot of oil. Reporter in neighboring new jersey, ac units are flying off the shelves. Fans, air conditioners. Im low on air conditioners. Reporter cooling centers are popping up all over chicago. Pool here, computers. Its a great place to come to. Reporter much of the heartland is caught under a heat dome. The upper atmosphere creates a lid, trapping hot air inside like a bubble, and then causing it to sink back down to the ground. Thats why cities are coming up with Creative Solutions to keep people cool. Like in rochester, minnesota, where you can hop on an airconditioned bus for free. You come in and dont have to pay. Reporter down south, the high temperatures crippling this highway in texas. More people have died as a result of recent years than any other weather event. Thats why authorities are remaining vigilant in california, where fastmoving fires have caused mandatory evacuation. Temperatures across the state reaching as high as 117 degrees. Really, really hot. We came to escape the heat and cool off at the beach. Experts say if you are going to be outside this weekend, you should come to a place like this, coney island, where you can get in the water and stay cool. In the meantime, avoid caffeinated drinks, wear light colored clothes and eat light, nutritious food. Morgan, thank you. Dylan dreyer is back with us. Its insuffer rabbable in a lot the country and its not going to go away. Its not like were breaking record temperatures. The humidity made it so unbearable. Heres the area of high pressure. Again, when you have high pressure, you have sinking air. It compresses and heats up. Thats why you have nothing moving and were seeing this last a long period of time. 110 Million People are under some sort of excessive heat warning or advisory or excessive heat watch. All because of the humidity. Your body cant cool down the way itd like to. Temperatures in the southwest, phoenix, 114 degrees. Las vegas, 114. Tomorrow is slightly cooler but still about five to ten degrees above average. The midwest, its going to feel when you factor in the humidity close to 110 degrees. Philadelphia will feel like 100 today. On saturday, still looking like its going to feel about 100 to 110. There is a cold front thatll cool things down throughout the midwest. Were looking for warm temperatures. Itll be more reasonable with lower humidity and temperatures in the 80s in the midwest that will move west by the end of the week. Thank you, dylan. Now, politics. Hillary clinton is set to appear in a few president ial pick tim kaine. Kristen welker is following all the developments from tampa. Good morning. Good morning to you. As hilalary clinton and tim kaie get set to hold their first appearance as a joint ticket, kaine, a 58yearold father of three is someone who checks all the boxes. Reporter Hillary Clinton making it official. Her number two is virginia senator tim kaine. Clinton campaigned last night, not mentioning her pick. Are we ready to win an election in november . Reporter at 7 30, soon after the event wrapped, clinton called kaine in rhode island and offered him the job. A half hour later, a blast text to her supporters, saying welcome him to our team. Kaine tweeted, im honored to be her running mate. Democrats would be ready to govern if something happened to her. Reporter kaine could struggle to help Bernie Sanders supporters, saying hes too pro trade and soft on wall street. Hillary clinton doesnt feel she has to do anything for the progressive wing of the party. Reporter republicans pounced. Donald trump tweeting, is it the kaine that took hundreds of thousands of dollars in gifts while governor of virginia . A reference to the strutcrutiny got for accepting 160,000 gifts received in office deemed legal. For clinton, the choice was clear. When the two campaigned together last week in virginia, Campaign Officials say clinton was impressed by his down to earth campaigning style. Its his resume that won clinton over. He is a former governor with Foreign Policy experience who also speaks spanish, which could help rally critical latino now, clinton is hoping kaine speaks to all voters and helps her win the white house. Kaine has been criticized for being a little boring. Thats something that clinton has said she loves about him. Theyre hoping their event today in miami will have plenty of fizzle as they court voters in this critical battleground state. Back to you. Little boring, all right. Kristen welker, thank you. Josh farrow is the senior insider and contributor. Liz is a correspondent. Good morning to both of you. Good morning. Lets pick up on the boring comment from kaine. Lets start with hillarys choice of tim kaine. Similar to Donald Trumps pick of pence. Why did they go the safe route . Yeah, i dont think there is anything wrong with being boring. You live in interesting times. To the contrast of donald trump and the noise around him, they want to donald trump is more unpopular than Hillary Clinton. She wants to keep the election on him. One way is to pick a Vice President nomineer interesting. Nobody is going to hate tim kaine. No one wont vote for Hillary Clinton because of tim kaine. Lets talk about donald trump. The morning after his crowning achievement, gets the nomination, and then holds this somewhat bizarre news conference. Event with volunteers. He rambles on and on. He goes after his rivals again. John kasich, ted cruz, talks about setting up a super pac. Why does it seem as if he cant let go of the primary . It was good for him. Donald trump rambling is what his accepting speech for the nomination didnt go on rambling because he had a teleprompter. That still felt he was normal. At the end of it, went on and was being loud and back to his aggressive leadership style. He said a month ago when asked, are you going to pivot to the general election, he said no. Im going to be who i am. That is donald trump. It worked for him in the primary. Well see if it works in the general. Basically, any knowledge that worked for previous elections doesnt work for this one. Well have to see. That aggressiveness, we saw it in philly. When we were in cleveland, it was clinton bashing central. Do you think were going to see that vibe in philly, or is it going to be a positive tone . I think there will be a lot of negative messaging about donald trump because there is so much material and i think thats what the democrats see as the best ticket in this election. Donald trump has negative impressions among the general public. Remind people why you dont like trump. Democrats can bring themselves to talk about why they like Hillary Clinton. [000 10 58;00] are clearly very uncomfortable talking about donald trump as president. But also because they need to build up her impressions. People dont like her either. Trustworthy ratings in particular are poor. These are people who like clinton a lot. Theyll want to share their message about why she would be a good president. Tim kaine may say hes boring. The election, anything but. Thank you for talking with us. Overseas, the gunman who terrorized munich on friday is dead. German police say he killed himself after killing nine innocent people as he went on a rampage there. Some of it was caught on camera. The big question this morning is why did he do it . Nbcs ron mott is on duty for us in munich. Goodorning to you. Good morning, craig, it was a warm, friday summer night. Absolute chaos erupted on the street behind me. In the air. Reporter the shooting captured on camera, reportedly showing the beginning of the rampa rampage. The gunman, dressed in black, pulls out a gun and begins to fire as people run for cover. Within minutes, police and ambulances flood nearby streets as terrified shoppers flee from the scene. It began before 6 00 friday night at munichs biggest Shopping Mall. Shots fired at the mcdonalds restaurant, and then inside the mall. A Duke University student was there with family and shot this video. There was a family approaching us. They were stream icreaming. They were in panic, in shock. Reporter nine people killed, sevente teenagers. Streets sealed off, transit shut down, highways closed and people warned to stay inside as police and soldiers pursued what witnesses thought police later confirming there was one gunman filmed on another cell phone video on the malls car park roof. Im german, he yells to the person filming, and eventually fires his gun. The suspects body was found two and a half hours later. Police say he was an 18yearold dperm german iranian. The motives, unclear. Those trapped inside the mall were finally bused to safety. Heavily armed police raided an apartment in the city. This morning, the Shopping Mall remains closed azors spzores s e to pay tribute. This appears, in the police which i haves words, to be a classic rampage. This has become classic. Ron mott thank you. Federal authorities are holding three men on charges of conspireing to support isis. The three are from palm beach county, florida. One was arrested as he was set to travel to syria to join isis. The other two are accused of supplying the man with weapons and training. There was a dramatic fire and rescue off the coast of florida. A barge erupted in flames, forcing crew members to abandon ship. The raft was spotted by a good samaritan, helping to bring them to safety. Dylan has the rest of the forecast. The big story is the heat for everyone except the pacific northwest. We have thunderstorms into the eastern south dakota. Well see stronger storms throughout the day, especially in the upper midwest. Central minnesota, we could see large hail and wind dpgusts nea we have a cold front that will cool things down. It tas until next week before it does so. Thats a look at the weather across the country. Heres a peek out your window. Mild and muggy window. The haze is over the metro area. Live view from the tower camera. 10 00, mid 80s. By 2 00, mid 90s. 4 00, maybe up to 98 or so. Itll feel like 100 degrees or higher between 2 00 p. M. And 5 00. 6 00, chance of a passing storm. Muggy and warm this evening. Mid 80s late evening. Dawn tomorrow, the mid 70s. Another hot day on sunday. Monday, tuesday, wednesday, thursday and friday, chance of after noon storms on monday. Thats your latest forecast. Still ahead, the trailer for suicide squad is out. Well give you a quick look at the movie thats expected to be the summers biggest blockbuster. And up next, soccer star hope solo, how shes getting prepared and making sure she is safe from the zika virus at e first, this is today on nbc. Over the next 40 years, the United States population is going to grow by over 90 Million People and almost all that growth is going to be in cities. Whats the healthiest and best way for them to grow so that they really become cauldrons of prosperity and cities of opportunity . What we have found is that if that family is moved into safe, clean, Affordable Housing, then the neighborhood begins to thrive and really, really take off. The oxygen of Community Redevelopment is financing. And all this rebuilding that happened could not have happened without organizations like citi. And citi has formed a partnership with our company so that we can take all the lessons from the revitalization of urban america to other cities, so we are now working in chicago and in washington d. C. And newark. Its amazing how important safe, Affordable Housing is to the future of our society. That musi hear the music and get excited. An olympic round up. 13 days until the start of the ryo to liolympics. The russian team could be banned tomorrow. Thats when an International OlympicCommittee Board is meeting to discuss the matter. The action is heating up. The u. S. Mens Basketball Team faced off against argentina last night in an exhibition to get ready for rio. Team usa, dominated. Winning 11174. Team usa hasnt lost a game in ten years. U. S. Womens soccer goalie hope solo isnt taking chances with the zika virus. Look at this. She tweeted photos showing the arsenal of repellants and nets shes bringing to rio. Are you going to have a full arsenal . I will not probably go that far. Its cooler down there than it has been, as well. Some of the concerns are not as heightened as they have been. Still to come, katy perry releases her first teaser of her video rise. Well share it in pop start. First, these messages. Exciting time, but you may experience common discomforts. Introducing trunatal from one a day. 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I have a Resident Named joyce, and i said come to class,bout lets start walking together that day i said ok its me and you girl, me and you i said if you need to stop, theres a bench well just hang out in the shade. She said absolutely not we are going to finish this race and we were the last ones in, but you know what . We finished the race. And she goes desiree, ill never quit walking. Ever no, no, no, no, [music] people are both soft and strong. Yey which is why our products are too. Angel soft. Announcer this is a news 4 today newsbreak. Thanks for joining us for this news 4 newsbreak. Im kristin wright. Today, you can help us clear the shelters by bringing home a new pet to join your family. 25 local shelters are participating to get dogs and cats forever homes. Theyll have reduced or waived adoption fees throughout the day. We have a live report at 8 00 a. M. Because of the the extreme heat, Power Outages continue in downtown d. C. A number of smithsonian museums are closed today because of the outage. The new museum is also closed. Tom kierein has a closer look at the heat advisory. Stay with us. Thats next. But how did we end up here . His mom thought he had the flu and that he was covered by the meningococcal meningitis. Vaccine he had received. Until 2014 there were. No vaccines for meningitis b in the u. S. Now there are. While uncommon, meningitis b can. Lead to death within 24 hours. Trumenba is a vaccine for 10 through 25 year olds to help prevent group b meningococcal disease. Trumenba should not be given if you had a severe allergic reaction after a previous dose. Most common side effects were injectionsite pain, fatigue. Headache, muscle pain, and chills. Ask your doctor about. All the risks and benefits of trumenba and tell them if youve received any other meningitis b vaccines. Meningitis b can be spread by typical sharing behaviors. A drink. A spoon. A kiss. It all started here. It might have been prevented with trumenba. Ask your doctor about trumenba. Mild and muggy with hazy sunshine on saturday morning. Temperatures jumping. By 10 00, mid 80s. Upper 90s by late afternoon. The heat wave continues as we get into tomorrow. There is a small chance of an afternoon st