california highway on their own terms. this is highway 20. you can see the fires burning and that dry brush is the major concern. the concern is that the embers from this dry brush will fly across and hit the dry brush over here, this whole area is tinder. for hours to create a fire break. >> it's important to create a buffer where fire crews cannot get in so if we create a large buffer between this road and the fire front, then we accomplished our goal. >> reporter: but this massive fire remains unpredictable. last night enormous flames, landscapes, the fire doubling in size since yesterday scorching 20,000 more acres in just five hours and it's threatening more than 6,000 structures. sarah workman is one of the 12,000 people forced to evacuate. >> finally smoking us out, and we got to get out of here. >> reporter: fires spreading through the west.

now 21 major fires burning in california alone. 8500 firefighters on the front lines facing dangerous conditions and the drought is changing how these fires behave. >> all the vegetation you see around us all the way from our very light grass to our very thick vegetation is very, very dry all the way down to the core, and that's why it makes fire conditions very dangerous and very extreme. >> reporter: on thursday, fire captain david rule was killed while scouting another fire. >> once you get in there and the fire heats up just right, no there is no escape route. we got to be careful. >> reporter: to make matters worse, lightning strikes are setting off new fires daily. >> veteran firefighters out there, 30 plus year firefighters that have never seen fire behavior like this. it's beyond extreme. >> reporter: stretching resources even further as more fires burn out of control. fire crews say it is extremely difficult to get ahead of the fire because of the

changing winds. they say it is spreading in all different directions and right now this fire has burned an area almost the size of cleveland. erica? >> perspective perspective, thank you. in tennessee a manhunt is underway in the shooting death of a memphis police officer. police have one man in custody but the search for the alleged kill there continues. we get details from carry sanders. >> reporter: a routine traffic stop turned deadly for memphis police officer sean bolton. >> heard bang, bang, bang, bang. >> reporter: the 33-year-old officer was shot repeatedly and despite a bulletproof vest, pronounced dead at the hospital. the first call for help came on patrolman bolton's police radio from a by stander. >> please, please, hurry up. >> they actually picked up the police radio and spoke into it and got the police to come out because all the of the neighbors on that side

were trying to call 911, but they couldn't get through. >> reporter: the first cop on scene frantically called for help. >> there was a traffic stop and he was armed. the subject bailed out. it was a traffic stop. >> checking, you are advising that the officer is down or the suspect? >> can you call an ambulance? >> ambulance is already in route. >> reporter: witness reports there may have been more than one person in the car and the gunman may have been in the front passenger seat. >> the only description on suspect will be two male blacks last seen running westbound on summer view. >> reporter: police broke down the door to an apartment complex and took one man into custody but the trigger man remains at large. this is the second police officer in tennessee killed in the line of duty just this year. nationwide, 70 officers have been killed this year doing their jobs. >> there is a theme do black lives matter? and at the end of the

day, we have to ask ourselves, do all lives matter? >> this again evidences the fact that there are so many guns on our streets in the wrong hands. >> reporter: officer bolton had no dashcam ra or body camera when she was shot. that equipment is budgeted for next year an iraq war vet, a police officer in memphis for almost five years gunned down in the very city where he grew up. carry sanders, nbc news. turning to politics, the results of our new nbc news wall street journal poll are out tonight. four days before the first prime time debate among the republicans. only ten of the 17 gop candidates will take the stage in prime time in ohio, not surprisingly, donald trump makes the cut. chuck todd has been looking at the numbers, chuck? >> erica, there is a lot of new stories in our new poll. let's look at the republican results.

two things jump out at he, number one obviously is donald trump rocketing to the top of the polls. the last time we had him in the poll before he announced was at 1% and leads at 19% and by the way, for those of you that think the trump candidate si is about tea parties or angry white guys, it's not about that. his support is across the board across the spectrum. this really is, he's consolidating the anti political establishment vote that doesn't have an ideal center. who is in and who is out? who finished in the top ten? guess what? we have three people who died for ninth. rick perry, chris christie and john kasich. one will get left out. according to the our kak calculations, that one will be rick perry. it's something to watch by tuesday, erica. >> that's what we will do. chuck todd tonight, thanks. as the republicans jockey for position

heading into thursday's debate, there is renewed focus on the democratic ticket tonight with the possibility of vice president joe biden entering the race. kristen welker is at the white house with more for us. good evening. >> reporter: erica, good evening. democratic sources say the vice president is personally torn. he's getting pressure to run from some democrats who don't think hillary clinton can go the distance but getting in now would mean playing political catchup. he's been a fixture at the president eastside 's side. could joe biden be eyeing the top spot. biden has been having meetings at his washington residence to explore the idea of taking on hilary in iowa and new hampshire. >> people close to biden are starting to have conversations about what a campaign might look like. >> reporter: it's no secret biden had been thinking about a run but those aspirations were put on hold when

his son beau died in may from a brain tumor at age 46. he might be the inspiration for his father to take the another look. father to run. he still said i think you should run. >> reporter: significant. some key advisors are working with clinton. she's captured big party donors and has a strong lead in polls among democrats. >> he shouldn't run. if he was going to run, he should have started a year ago to consome consolidate support. all the biden donors have went to hillary clinton already. >> reporter: at times he's been criticized for getting too up close and personal. he's run for president twice before and campaigns with stumbles and gaps. >> you cannot go to the a 7 eleven or dunkin donuts unless you have a slight indian accent. i'm not kidding. >> reporter: questions about clinton's e-mails and

transparency eroded her trust. 51% unfavorable rating is high compared to biden's 39% and biden has been in this game a long time. >> joe biden was elected to the senate when he was 29 years old and he's been a rising star in the party since. this man is wanted to be president his entire life, so it's not surprising that he would be thinking about whether or not he wants to the make a run in 2016. >> reporter: the vice president's press secretary downplayed the speculation saying he's focused on his family and immersing himself in work. biden is expected to make a final decision at the end of summer. erica? >> thanks. a tragic scene in russia today. it happened by a squad of helicopters. one started spinning out of control losing altitude and crash into a field erupting in a fire ball. one of the pilots was killed, the other did survive. officials say the hydraulic system failed. the discovery of a

wing part that may be from that missing malaysia jetliner set off an intense search for other objects that might also have come from the plane. we get more tonight from nbc's bill neely who remains on reunion island, bill? >> reporter: good evening, erica, from a dramatic coastline, the search for debris has widened from this the island today. the authorities from malaysia where mh 370 began the doomed flight, asked everyone in this part of the ocean to look out for aircraft debris. that's an alert to search more than 4,000 miles of coastline. here today people have been handing in objects they found on beaches. police came to one where they were giving a small object they put in a metal box. there were reports of a door being found. one item was found to be a normal ladder. malaysia search experts saying none of

these objects is related to the missing plane. as i discovered, the beaches here are littered with metal and rusting junk. police are taking in what people find but so far the only relevant find are that piece of aircraft debris and a suitcase found nearby. both are now in france. the aircraft part, wing flab from a boeing 777 won't be examined until wednesday. the suitcase is at another lab where they will try to match it to the dna of the missing passengers and crew. well, here there is quite a storm. the ocean very rough. people here hoping that might throw more aircraft debris on to these beaches. erica? >> bill neely tonight. bill, thank you. another american hunter is accused of illegally killing a

lion in zembobway. >> reporter: cecil may be the most famous lion to die at the trophy hunter but wasn't the first. wildlife officials accused a second american, pennsylvania doctor and bow hunter jan sesky of killing another lion back in april saying his guide hunted without a quota and permit. the guide was arrested and officials say he's cooperating. he's a cancer doctor in pittsburgh. today at his home, one answered. nbc news has not been able to reach him for comment. meanwhile, the death of cecil and the fate of his pride gripped the world. last night his image lit up the empire state building, a report his alibied jerico seen on the left also had been killed spread across special media. this morning researcher brent went looking for jerico and snapped this picture tweeting he is alive

and well. researchers believe he'll take over the pride now that cecil is gone. >> things will be hard for him but he's a mature lion. he's 11 years old himself and been through all sorts of fights and experienced lion. so i think they got quite a good chance. >> reporter: the zimbabwe government suspended the hunting practice, no more bows and stopped all big game hunting around the park where cecil roamed. >> hunting of lions, leopards and elephant in areas has been suspended with immediate effect. >> reporter: while the government is seeking to extradite the dentist, it's unclear whether they will sesky. when "nightly news" continues on this sunday, what happens when things don't work out between humans and robots? we'll tell you a congratulations. you're down withzcrestor. yes!

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in the quest to better understand how man and machine can relate. a social experiment sent a robot on the road. they hoped it would make its way across the country with human help until the plan hit a snag. >> reporter: unlike other robots designed to help people. >> he talked again to me. >> reporter: hitch both bot mission was so see how many people would help it. in a huge test of humankindness, this immobile kid-sized robot counted on strangers to get around. >> it's like walking

around with a celebrity. >> i think the opportunity for people to actually engage unsupervised, you know, with this kind of technology was really part of the charm of it. >> reporter: beginning in canada where it was created, hitchbot spent 26 days hitchhiking and 18 days in the neither lands and ten days in germany and grabbed a cold beer. two weeks ago, hi irks hitchbo the t hit hiked across america. start income most within hopes strangers would take it to times square, mount rush more and the grand canyon. hitch bot did well until arriving in philadelphia where it got no love from someone in the city of brotherly love. after two weeks in the u.s. the journey ended ended. of 46,000 followers, one tweeted i'm sorry your trip was cut short in philly.

another, poor innocent hitchbot. >> i didn't expect to happen so many people happy to root for hitchbo the t and talk about it. that's wonderful. >> reporter: today the grand social experiment has ended but in it perhaps a lesson for all of us. the final message, my trip must come to an end for now but my love for humans will never fade. rehema ellis, nbc news, new york. up next, the results are in for the election we've been watching closely all weekend. you owned your car for four years. you named it brad. you loved brad. and then you totaled him. you two had been through everything together. two boyfriends. three jobs. you're like "nothing can replace brad!" then liberty mutual calls. and you break into your happy dance. if you sign up for better car replacement, we'll pay for a car that's a model year newer with 15,000 fewer miles than your old one. see car insurance in a whole new light.

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the windows 10 400. the brakes lock up as he made a pit stop and his car running into crew members sending a tire and jack flying. fortunately, no one was hurt. the crew got up, worked on the car and the driver was on his way. look at this, american furrow on his first race since winning crown. in second place behind competitive edge and then turned it on as they came around the bend in new jersey. and there you see american pharoh wins again in one of the last appearances in his racing career. news from space tonight via twitter. scott kelly an astronaut aboard the international space station was taking questions. loving the photos, do you ever just look out the window and freak out? kelly's answer, i don't freak out about anything, mr. president, except getting a twitter

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for most of us memories of the wedding day are the most cherished but what if they were suddenly gone? kate snow on one couple determined to recreate their special day. >> reporter: one year ago yesterday they had the picture perfect wedding. just one problem, the bride doesn't remember a thing about it. 19 days after her wedding day, she was in a terrible car accident. weeks later, she realized she lost about five weeks of memories leading up to the crash. >> i don't remember the wedding. i don't remember getting married to you. i looked down at the ring and was like something is up. >> you had no memory of the wedding? >> no. >> the ceremony? >> like a nightmare, like somebody telling you a bad dream. >> jeremy was heart broken but decided right then and there

he had to find a way to throw his wife good wetting. >> if she wasn't happy, i wouldn't be happy so why not create another memory. >> so this weekend they started over with the help of total strangers that donated to an online funding site and their small virginia community who pitched in from hair to tuxedos, flowers to photography. >> what made you stop? >> the love for his wife and he would take the time to create something like this for his wife really spoke to me. >> the carriage entrance was a surprise arranged by the groom. so many details exactly the the same. >> consider this as the best gift that jeremy could give to you, the gift of giving you your wedding day back. >> reporter: they repeated their vows with a nod to last year. >> like i said the first time, anything that happens, nothing ever will tear us apart.

>> the minister making this new ceremony all about the bride. >> and now justice, you may kiss your man. [ laughter ] >> reporter: for jeremy and justice, it was a second chance to say i do and recreate a memory to have and to hold for the rest of their lives. kate snow, nbc news, virginia. that's "nbc nightly news" for this sunday.

america's got talent is ten years old. wow. [dramatic inspirational music] at last (howard) this is the only venue

for all these variety acts. where do they get a forum like this? that was awesome! th is amazing! (howie) this is more than $1 million. this is a dream. [vocalizing] these are people's lives. this is every waking minute of their day. (mel b) we see everything any anything. it's what keeps people coming back to watch it season in, season out. that was amazing. (heidi) it is such a fun show. i have front-row seats. and the people that come onto the stage are amazing. [glass shatters] - [yelps] (howie) you would think that we would run out of talent. time and time again, we prove you wrong. there's a lot more to see. [explosions]

america's got talent is the only show that offers absolutely anything and everything that anybody who has ever seen a television could want. the show has changed vastly over the last ten years. we have traveled to the far corners of this country. it's the portland auditions. (nick) new york, baby! houston! st. louis! universal, orlando. (howie) there's been eight judges. [cheers and applause] (regis) brandy... david hasselhoff... (nick) sharon osbourne... piers morgan... howie mandel, mel b, heidi klum, and howard stern. [cheers and applause] i was a fan of the show before i was even on it. you know, it is an amazing show about talent, about variety. i mean, our show has puppets and ventriloquists and, you know, magic dragons and you name it.