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Tonight. Donald trump hitting the campaign trail after the new charges in the mar. A Lago documents investigation. Mr. Trump appearing with a dozen fellow GOP presidential candidates in Iowa. It comes a day after that superseding indictment was unsealed. The special counsel accusing Mr. Trump of telling a worker at his Florida estate to delete security video as part of a cover up.

Former President slamming the new charges. If he's convicted, would he stay in the 2024 race? What he said about that today was our one on one with Governor Ron DeSantis as he looks for a campaign reset, how he's responding to black Republicans who blasted changes to Florida's teaching and guidelines around slavery just in, President Biden for the first time publicly acknowledging the child his son Hunter fathered out of.

Wedlock.

As his grandchild. What he's saying. Tonight, under arrest, the Alabama woman who admitted faking her own kidnaping charges. She now faces the hottest day of the year for millions in the Midwest and Northeast. Nearly 150 million on alert. The frightening images, the amusement park rides spinning backwards, operators unable to stop it for minutes.

As his grandchild. What he's saying. Tonight, under arrest, the Alabama woman who admitted faking her own kidnaping charges. She now faces the hottest day of the year for millions in the Midwest and Northeast. Nearly 150 million on alert. The frightening images, the amusement park rides spinning backwards, operators unable to stop it for minutes.

What went wrong?

And Walmart of the future. How A.I. is changing the world's largest retailer.And Walmart of the future. How A.I. is changing the world's largest retailer.

This is NBC Nightly News with Lester Holt.

Good evening and welcome. Former President Trump reacting with a string of insults to the new charges added against him in the Mar a Lago. Secret documents case decrying what he calls the horrible people he thinks are behind it. The special counsel in a sense, doubles down on its document investigation, now accusing Mr. Trump of being part of a scheme to delete security camera footage of the property contained on a video server, what the government describes as an attempt to obstruct the investigation.

And prosecutors also adding a third defendant to the case, charging a maintenance supervisor who they say told another Mar a Lago employee the boss wanted the server deleted. Tonight, the former president's defenders largely ignoring the elements of the case as they focus, rage on the Biden administration and the DOJ. Garrett Haik now with more on Mr. Trump's reaction.

Former President Trump on the attack tonight against prosecutors and those three new federal charges against him. They're trying to intimidate people so that people go out and make up lies about me because I did nothing wrong. In the new charges, the special counsel alleging Mr. Trump sought a cover up to conceal classified documents at his Mar a Lago home by deleting surveillance video now charging a new defendant, Mar a Lago property manager Carlos de Oliviera with two obstruction counts and with making false statements to the FBI.

In the indictment, prosecutors say on June 23rd last year, the day after the government subpoenaed surveillance video from his home, the former president spoke by phone with De Oliviera for 24 minutes. The next day, Mr. Trump's personal aide, Walt Nada, who's also been charged, allegedly changed his travel to go to Florida. On June 25th, prosecutors say Nada and de Oliviera looked at surveillance video in a Mar a Lago security booth and walked through a tunnel with flashlights, pointing out cameras.

Two days later, de Oliviera spoke with an I.T. staffer identified as Employee four, who told him the server retained camera footage for 45 days. De Oliviera allegedly saying the boss wanted the server deleted. The employee responded He would not know how to do that and that he did not believe he would have the rights to do that. De Oliviera allegedly insisting that that's what the boss wanted, asking What are we going to do?

The indictment does not say if any footage was deleted.

Fine people and.

I don't think they think that the tapes were even changes. My tapes that we gave to them, the new charges, putting the Republican frontrunner in more serious legal jeopardy. But so far, each new indictment has been a political boost.

I'm the only.

Person ever got indicted who became more popular.

Because people.

Understand that. They read it, they see it. The new indictment also charges Mr. Trump with possessing a top secret military document he has denied existed but is heard on an audio recording discussing with aides and journalists. It is highly.

Confidential. This is secret informant.

Mr. Trump's GOP allies leaping to his defense, noting the new charges come one day after the DOJ's controversial plea deal for president Biden's son, Hunter, collapsed under a judge's scrutiny.

People are tired of these weaponized federal agencies and that if your last name is Biden, you get to live by a different set of rules versus if your last name is Trump, you get targeted by these agencies.

And Garrett, Mr. Trump also saying tonight a potential conviction would not end his campaign.

That's right, Lester. The former president making clear he is staying in this race no matter what, even making the fact that he's under so many investigations a core part of his campaign message going forward.That's right, Lester. The former president making clear he is staying in this race no matter what, even making the fact that he's under so many investigations a core part of his campaign message going forward.

Lester Garrett. Hey, thank you. Let's bring in senior legal correspondent Laura Jarrett and chief justice contributor Jonathan Deans. Laura, let me start with you. We heard about Trump employee number four. What's the guess as to whether that person is cooperating?

I think it's a high likelihood that Lester had it at Lester, and that's based off of what's revealed in that new indictment. There are striking details that prosecutors would be unlikely to have otherwise, but a new additional defendant now opens the door to more opportunities for potential delays. Prosecutors know this. And already we see the Justice Department telling the judge that the trial date set for next year shouldn't slip.

And, Jonathan, we could see another indictment as soon as what, next week?

Know Lester, this is about Mr. Trump's actions leading up to January 6th. And today he posted he expects nothing to come out of that meeting between his lawyers and the special counsel yesterday. Defense attorneys for Trump allies wonder if prosecutors will charge Trump and Trump alone as a start, or will others be indicted as soon as next week?

Several lawyers tell us so far, Trump is the only one they know of who has received a target letter. So next week we again watch and wait for that grand jury on Tuesday.

Jonathan and Laura, thank you. Good to see you. And the former president shares the stage with Florida Governor Ron DeSantis in Iowa for the first time tonight. Paul, as DeSantis is pushing back against criticism of a new curriculum on slavery. He just spoke to Gabe Gutierrez tonight.

Governor Ron DeSantis in Iowa under fire. There is no silver lining. Freedom in slavery is GOP rival Tim Scott, the only black Republican senator slamming the state of Florida for adopting new public school standards that teach how slaves develop skills which in some instances could be applied for their personal benefit. It's a line of attack first launched by Vice President Harris.

They want to replace history with lies.

Another black Republican member of Congress, Florida's Byron Donalds, who endorsed former President Trump, has also criticized that portion of the new standards. But DeSantis argues that line has been taken out of context.

I would also note some of those congressmen are putting out information that's totally false. You got to be willing to stand up and fight back against false narratives. And that's what we do in Florida every day.

One of the scholars who helped develop the Florida standards is also defending that this curriculum is devoted to telling the truth. Whereas Kamala Harris has retold a lie after laying off more than a third of its staff that the Sanders campaign is trying to reset. Holding more up close.

Events with voters and their.

Families.

What is that?

Yeah, that's probably a lot of sugar.

While Mr. Trump is still dominating the field. If we make it about the.

Vision for the future, we're going to win. Obviously, with me as the nominee, you know, we're going to focus on Biden's failures and our vision for the future. That's what the election will be about. If Donald Trump is the nominee, it's going to be about all those other issues.

With all due respect, Governor, you're down by 30 points, though.

Well, no, I mean, that says you. I mean, I can tell you, we've been in Iowa. I'm the one showing up at all these places. We're signing up people day after day.

Here in Iowa. Tonight, the Lincoln Dinner will feature 13 GOP presidential hopefuls. All except Chris Christie.

All right, Mr. Gutierrez, thank you. In Alabama, charges announced today against Carly Russell, who admitted she made up that story about being kidnaped and seeing a child on a highway. Russell was charged with two misdemeanors for falsely reporting those claims. She was arrested and freed on bond. She faces up to a year in jail and a $6,000 fine.

Now to the record breaking heat. Nearly 150 million under alert from coast to coast, with many in the Midwest and Northeast experiencing their hottest days of the year. Miguel Almaguer now with more on what researchers are learning to combat the heat.

Tonight is the northeast swelter through its hottest days of the year. I don't like the spread of the heat index in cities like New York, Washington, D.C. and Philadelphia have all soared into the triple digits.Tonight is the northeast swelter through its hottest days of the year. I don't like the spread of the heat index in cities like New York, Washington, D.C. and Philadelphia have all soared into the triple digits.

I feel like my skin is sticky.

With July expected to become the hottest month in history. Today, 35 states and D.C. are under heat alerts. Climate change helping to push temperatures up to 20 degrees above average. As Phenix approaches 30 days of temperatures at or above 110 degrees. Maricopa County officials confirm at least 25 heat related deaths so far this year, with 249 still under investigation.

This cooled homeless senior center, which also offers medical care, is saving lives. What kind of shape do you find some people in after they come in, after a long day out in the heat or dehydration?

We've had members coming here with dehydration. They've fallen out. They've had spasm and gone to the mountains.

Nearby at Arizona State University, researchers are using robots to better understand the impact of extreme temperatures on the human body. And this crash test dummy for heat and sweat. Breathe and move. Can see how quickly people heat up and potentially then go back and see what type of interventions we could have done to decrease the heat stress. Tonight, new research in the lab and a new reality outside of it.Nearby at Arizona State University, researchers are using robots to better understand the impact of extreme temperatures on the human body. And this crash test dummy for heat and sweat. Breathe and move. Can see how quickly people heat up and potentially then go back and see what type of interventions we could have done to decrease the heat stress. Tonight, new research in the lab and a new reality outside of it.

Miguel Almaguer, nbc news, phenix.

In New york, scary moments caught on camera at an amusement park, a ride spinning backwards, out of control with riders trapped on board. No one was hurt. But as Emily Akita reports, the incident is raising serious safety questions.

At first glance, this looks like a thrill seekers paradise. But panic started to set in when the Music Express in Rye, New York, wouldn't stop earlier this week. Heading off for the flow of Parkgoers, pleading to pull the plug as the wheel of cars spun for an extra 3 to 4 minutes. The maintenance team ultimately shutting down power, according to a Playland spokesperson who blamed an electrical issue and reported no injuries.

Everybody was afraid. Everybody was shocked. Nobody know what to do.Everybody was afraid. Everybody was shocked. Nobody know what to do.

It's the latest incident in a series of wrong turns at amusement parks and carnivals across the country, leaving some on edge about the summertime staple heroines. Tallest coaster straddling the North and South Carolina border remains closed and under review tonight after a visitor discovered a frightening crack earlier this month. The support been visibly shifts when the coaster comes through.

I'm not an engineer, but that's not it's not good.

That same weekend in Wisconsin, roller coaster riders got stuck hanging upside down for 3 hours after a mechanical failure and in a serious mishap in Illinois. A ten year old boy landed in the hospital after he was flung from a carnival ride approximately 10 to 20 feet in the air, according to a family members GoFundMe post.

Obviously, our biggest concern is to make sure something like this doesn't happen again.

There are roughly 32,000 injuries from amusement rides annually, according to federal data. But many industry experts maintain they are safe with hundreds of millions of people flocking to carnivals and parks every year. Lester.There are roughly 32,000 injuries from amusement rides annually, according to federal data. But many industry experts maintain they are safe with hundreds of millions of people flocking to carnivals and parks every year. Lester.

Emily, thank you. In 60 seconds with Senate Majority Leader Mitch McConnell said today about his future after that scary moment this week. And President Biden acknowledges another grandchild for the first time. What he said next. Two incidents with high profile senators this week have put a new spotlight on the age of our top political leaders. Already a contentious issue in the 2024 presidential race.

Here's Peter Alexander.

For America's lawmakers, seniority has long meant power and prestige. But now it might also be a political liability. Today, the Senate's longest serving leader, Republican Mitch McConnell's office, insists he intends to serve out his term. Days after the 81 year old froze mid-sentence.

McConnell, a childhood polio survivor, has suffered a series of recent falls, cracking a rib and suffering a concussion. Got to watch on a sandbag. But he joked about this week's episode hours later as Republicans stand by him. Mitch, a strong. He's stubborn as a mule. He's not the oldest in office. 90 year old Democrat Dianne Feinstein, who some members of her own party have urged to resign, appeared confused during a committee meeting yesterday.

Starting to give a speech when she was only supposed to vote on a bill submitted with respect.

To say I'm.

Okay.

Feinstein's office later saying the situation was a little chaotic and that the senator was preoccupied. The 118th Congress is the third oldest since 1789. President Biden's age is already a key issue ahead of 2024. Stumbling on steps, tripping over a sandbag. Adding to the scrutiny, the president's increasingly trying to diffuse any criticism about his age. Think about it.

I know I'm 198 years old. Already America's oldest president. At the end of a second term, Joe Biden will have just turned 86. The Republican front runner, Donald Trump, would be 82. A recent NBC News poll found more than two thirds of all voters say they have concerns about the president having the necessary mental and physical health to serve.

55% say the same about former President Trump.

When you look at how much a president ages in just four years and they're already at that age, what's that leave us with?

And Peter, we have some late breaking news tonight regarding president biden's family.

Lester that's right. For the first time tonight, president biden is publicly acknowledging his four year old granddaughter, navy joan, the child of his son, hunter biden and an arkansas woman out of wedlock. Republicans have criticized the president for not acknowledging a seventh grandchild. But in a statement late tonight, President Biden says it is not a political issue. It's a family matter.

He adds. He and the first lady want what is best for all of their grandchildren, including Navy Lesser.

Peter Alexander, thank you. Up next, what happened when Wal-Mart embraced A.I. and what it might mean for employees at the retail giant and far beyond. Back now with our series A.I. Revolution and in Focus tonight, jobs, how they're performed, how they're changing, and the potential risks that A.I. poses to them. To find out, Jake Ward went to the nation's largest private employer.

Once upon a time, Jose Avila had had an incredible memory started.

Were you supposed to.

Have memorized where everything is? Yes. And great shoes.

So I would have to actually take them to the items that they needed. So from one end to the store to the other.

But today, an AI powered app shows where everything is and needs to go.

It's making my job much easier.

Wal-Mart is already a cost cutting machine, and yet the company wants to be even more streamlined. Sanjay brought a Christian is in charge of making that happen. How can you possibly grow more efficient than you currently are.

Jake? That's where I think technology will play a key enabling role. We are transforming our supply chain and our store operations.

And as we saw in this California superstore, A.I. is how they plan to do it when trucks arrive to be offloaded. Air has already organized the pallets inside. It looks disorganized to me, but.

If I understand.

Correctly, A.I. is telling you through the phone where everything is and where it should go.

Yes. We'll have to open up our camera.

Right, and hold up our work device. And then it's going to tell us what boxes need to go out. Sensors in every aisle spot things.

As small as a freezer.

Door left open and even organizes the shelves.

Then we can learn and say, okay, the two phases of this do better. Then maybe putting another Brandon or another flavor in there. Right?

Wal-Mart is the nation's largest private employer. And what they decide to do when it comes to efficiency sets national standards. So when they decide to adopt A.I.

It has implications for the whole country.It has implications for the whole country.

And that, of course, raises a crucial question for workers. Does I, do you think, forecast a world in which you won't need as many humans in this store?

We view technology as helping our associates to evolve physically, demanding jobs into more fulfilling higher skilled jobs. So over time, we believe that will be about the same or more number of associates in the company.

As a retail worker. Can I sort of relax about my job in the future, do you think? No, I don't think that you can. Experts say the number of jobs may remain the same, but people without the right skills won't get them. There are increasing frictions in the workplace such that it is harder for workers to transition from one job to a new job.

AVILA The.

Store lead, says.

Workers here are happier in the age of AI.

Head count. And our turnover is much better from two years ago. Much better.

And now we'll see how.

Working in a world of low prices and high efficiency compares to shopping in one. Jake Ward, NBC News, Gilroy, California.

And that's Nightly News for this Friday. Thank you for watching, everyone. I'm Lester Holt. Please take care of yourself and each other. Goodnight.

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