captioning sponsored by cbs >> diaz: tonight: phone call firestorm. president trump suggests he did talk about joe biden with ukraine's president, but denies using his office to undercut a political rival. >> there was nothing. >> this appears to be an overwh of tonight a war of words, the u.s. and iran intensify attacks , as we get to see the damage done by last week's oil strikes . democrats trade places. >> hello, iowa. a new poll shows a checkup. dean reynolds talk to other works are there. scientists say birds are

disappearing by the billions, what is empty and the skies? taking the field and how these young afghans are taking the taliban on on and off the field. this is the "cbs weekend news." >> diaz: good evening. i'm adriana diaz. for the first time president trump today suggested that he did discuss former vice president joe biden and his son during a phone call with ukraine's president. the issue has sparked a new political firestorm for the president, following him all day-- including stops in two states-- before arriving in new york. nikole killion has the latest from the white house. >> it was a perfect call. >> reporter: as he departed the white house for events in texas and ohio president trump continued to face questions over a phone call with ukrainian president volodymr zelensky. >> the conversation i had was largely congratulatory, was

largely corruption, all of the corruption taking place, was largely the fact that we don't want our people, like vice president biden and his son, creating to the corruption already in ukraine. >> reporter: the july 25 call has ignited a political firestorm following a whistleblower complaint. during the call, the president reportedly pressured zelensky to investigate biden's son, hunter, who worked for a ukrainian gas company. >> there was no quid pro quo, there was nothing. >> reporter: mister trump denied holding up military aid to ukraine over the matter and said he's okay with his attorney rudy giuliani, who also reached out to the ukrainian government, testifying before congress. >> what they are trying to say is, i went there for a political mission to kind of get joe biden in trouble. ridiculous. >> focus on the violation of the constitution this president is engaged in. >> biden has denied discussing his son's job overseas.

>> if he was protecting his son and intervened with the ukrainian leadership in a way that was corrupt, i do think we need to get to the bottom of that. >> wile some in the administration suggested biden should be investigated, democrats argue if the claims against the president are proven then impeachment is the only option. >> if the president is >> if the president is essentially withholding military aid at the same time that he is trying to browbeat a foreign leader is trying to browbeat a foreign leader to doing something illicit that is providing dirt on his opponent during a presidential campaign, then that may be the only remedy that is co-equal to the evil that that conduct represents. >> diaz: ukraine says no pressure was put on its president. he is expected to meet with mr. trump during the u.n. general assembly this week. adriana? >> diaz: nikole this week congress will hear from the acting director of national intelligence about the whistle-blower complaint that is at the center of all of this. what can we expect from that.

>> house speaker nancy pelosi says she expects the acting director to not only turn over this complaint but also to eventually allow this whistle-blower to speak. so far she has resisted calls for impeachment. but did warn of a whole new state of investigation if the administration does not comply. >> nicole, thank you. now to escalating tensions in the now to escalating tensions in the middle east. today, iran's president called on western nations to "stay away" from the persian gulf. at the same time, the sparring goes on-- including threats of an all out war-- over who's responsible for last week's attack on oil facilities in saudi arabia. ian lee is in riyadh. >> reporter: what started out as an attack on two saudi oil facilities, leaving twisted metal and burnt out fuel tanks, has turned into a war of words. iran's president hassan rouhani said today the u.s. is creating an arms race in the region. while iran's foreign minister javad zarrif told margaret brennan on "face the nation," it could lead to conflict.

>> i'm not confident that we can avoid a war. we-- i'm confident that we will not start one. >> reporter: secretary of state mike pompeo shot back: >> iran's foreign minister, as you may have heard, has repeatedly denied any part played by iran in this attack. will the u.s. release evidence that proves he's lying? >> well, we already have. there-- there's already ample evidence that demonstrates that he's lied. you saw the saudis showing these were iranian systems built-- built and manufactured inside of iran. >> reporter: this week, saudi arabia showed us what they said is the evidence tehran was behind the attack-- despite yemen's houthis rebels still claiming responsibility. the blast marks on the refineries point north-- toward iran. you can see five of these towers were hit and when you look at the damage that was done, you can see that it is pointing in a north westerly direction. that is likely where the projectiles came from. >> saudi saudi officials also claim the pieces of drones and cruise missiles recovered were made in iran.

but a team of u.n. investigators is in the country independently inspecting saudi arabia's claims. tonight, the tensions are still high. the united states says the additional troops are taking a defensive posture, but iran has continued to warn that any strike on the country will see swift and broad retaliation. adriana? >> diaz: ian lee in riyadh, thank you. now on the road to 2020. a new poll of likely democratic voters in next year's iowa caucus at the top for now. the des moines register cnn shows warren leading biden by two point, sanders a dispant third. cbs news ed o'keefe is on the campaign trail in waterloo, iowa tonight. how is the new poll playing among the campaigns? >> well, adriana, this is the first significant lead change, the fact that biden has slipped to second is notable. he has universal name recognition, you talk to rival campaigns and long time observers in this space and

credit warren and her team for building out an operation that is increasing her support. we shouldn't put too much into polls this early in the cycle but the polling done by the des moines register through the years is often the one that ends up predicting the winner which is why this poll especially gets extra attention. >> diaz: that say good point. id, the poll shows that just one in five identify what sloarts say they made up their mient have who to support. is that what you are hearing from voters. >> oh, it absolutely is, adriana, take example of a woman we met who said she would love to see warren and pete buttigieg end up on the ticket but was on her way to an yang event and said she is a fan of klobuchar and if vice president biden, she is okay with that too. indecisive voters, they have 134 days to decide. >> diaz: ed o'keefe in waterloo. thanks. both joe biden and both joe biden and elizabeth warren joined striking g.m. workers on picket lines today. the former vice president was in

kansas city, kansas. warren was with workers in detroit. and as dean reynolds reports, the nationwide walkout isn't just about the terms of a new contract, but big changes down the line. >> reporter: as negotiations proceed at this detroit hotel. difficult questions are demanding answers about the future of the auto industry and its workers. michelle krebs is an executive analyst with cox automotive. >> how many jobs will exist because of electric vehicles, autonomous vehicles, automation? those are issues of real concern for the far out future. >> reporter: electric vehicles-- still an unusual sight on the nation's roads-- are gathering momentum. g.m. plans to introduce 20 new. all-electric models by 2023-- a major-- if still uncertain -- step away from gasoline or diesel power. electric batteries and motors are much simpler to make than the internal combustion engines powering most cars today. they require only a few hundred parts instead of thousands. that means fewer workers on the factory floor.

and fewer workers needed to keep the vehicles running once sold. which, in turn, means fewer profits for dealerships and their mechanics. and yet, along the picket line. u.a.w. member karen huffman thinks there's a bright side. >> you're always going to need people to build these vehicles. >> reporter: analysts say the coming transformation is undeniable. >> we know that eventually electric vehicles, autonomous vehicles, new ways of us acquiring personal transportation is going to happen. we don't know when that will be and we certainly don't know when anyone's going to make money on it. >> reporter: big questions in need of answers-- and not just for autoworkers. dean reynolds, cbs news, detroit. >> diaz: here in new york, a landmark united nations summit on climate change takes place tomorrow. yesterday, teen activist greta thunberg of sweden-- who's mobilized millions of young people-- received a raucous welcome. many world leaders will attend, but the united states is sending only a low-level state department official.

a 65-year-old lebanese man is under arrest in greece tonight, a suspect in the 1985 hijacking of t.w.a. flight 847. this photo of pilot john testrake with one of the hijackers remains the enduring image of the 17 day ordeal. hijackers shot and killed a u.s navy diver, and held more than 150 passengers and crew hostage before eventually releasing them. tomorrow on "cbs this morning" we're kicking off a new series, "medical price roulette" with our journalism partner "clear health costs." it's an in-depth look at why hospital and health care bills can vary so dramatically-- taking unwitting patients by surprise. frank esposito says his doctor told him he needed emergency back surgery or he could face paralysis. then, over $650,000 in bills arrived. >> what was my choice? just be paralyzed for the rest of my life? it was bad enough bein' outta work, and not being able to make a paycheck.

but then to get these bills that were so overwhelming. and you say, this can't be real, i mean, i really don't have to pay this. how am i gonna pay this? and you sit there. and you start cryin' cause you don't know what you're gonna do. you have no sense of, of reality anymore. you don't know what you're gonna do. >> diaz: our new series "medical price roulette" begins tomorrow, on "cbs this morning" and the cbs evening news with norah o'donnell. straight ahead on the "cbs weekend news," chanel miller-- the sexual assault survivor whose words helped spark the "me too" movement-- speaks out. also, why are billions of birds disappearing from the sky? and the women of afghanistan-- refusing to turn back, if the taliban returns.

>> diaz: for nearly five years, she has remained anonymous and silent. but now, chanel miller is speaking out about her life after former stanford university

swimmer brock turner was convicted in 2016 of sexually assaulting her. in an exclusive interview with "60 minutes" tonight, miller talks about her outrage at his short sentence. >> as chanel spoke directly to her assailant in court, she says she noticed people crying. brock turner wouldn't look at her. >> your damage was concrete, titles, degrees, enrollment. my damage was internal. unseen. i carry it with me. you took way my worth, my privacy, my energy, my time, my safety, my intimacy, my confidence, my own voice until today. >> after she spoke her last words, judge ar the judge handed down his sentence. citing the defendant's good character, the fact that he had

been drinking and the impact prison would have on his life, the judge sentenced turner to six months in jail with good behavior, he would walk free in 90 days. >> the prosecutor had been asking for six years. >> yes. >> how did that hit you. >> i was in shock. i just put aside a year and a half of my life so he could go to county jail for three months. young men, particularly young men of color serving longer sentences for nonviolent crime, for having a teeny weenie bit of marijuana in their pockets. and he had just been convicted of three felonies and is he going to serve one month for each felony. how can you explain that to me. >> diaz: you can see bill whitaker's full interview with chanel miller tonight on "60 minutes." next on the cbs weekend news:

why sparrows, blackbirds and finches-- all familiar backyard birds-- may be facing extinction.

>> diaz: wild birds are disappearing across north america at an alarming rate. a new study finds more than a quarter of the entire bird population has vanished in the last half century. jonathan vigliotti has more in tonight's "eye on earth." >> how accurate are these numbers. >> the numbers are extremely accurate. >> reporter: north america's bird population dropped by a staggering three billion in just 50 years. the alarming die off outlined in a new paper. peter mara peter marra, senior author and director of the georgetown environmental initiative calls it an environmental crises. >> i think this needs to be a wake-up call this is a horrible situation and

it's about time people wake up and started taking care of their environment that we need to do. because it's an environment that we also depend on. >> reporter: the study brought together information gathered since 1970, much of it collected by thousands of volunteer bird enthusiasts from across the u.s. and canada. hardest hit: grassland birds like sparrows and goldfinches, losing more than half their population; and shorebirds, seen in coastal regions, whose population has fallen by more than a third. researchers aren't sure what's making birds to be so vulnerable, but point to humans. potential reasons including the destruction of natural habitat and use of toxic pesticides. >> when we lose them it's like burning the yard. it's like tearing down our museums. we're losing our heritage. so our children and their children, these future generations will not be able to share, you know, watching these flocks of birds that we watched. >> to me it tells us that that we're a little sick, we need to get back on the mend. >> reporter: marcos trinidad is

the director of the audubon center at debs park, an oasis for wildlife minutes from downtown los angeles. >> birds are important because they tell us a story about our environment, just based off the birds you see present in the community. >> reporter: the canary in the coal mine. >> the canary in the coal mine. >> reporter: trinidad says it's a sign that conservation efforts on a legislative level. and in local communities has to happen now. >> i think of these birds as sort of the rembrandts, the monets, the homers. they're priceless pieces of art that exist in nature. >> reporter: priceless art peter marra hopes can be enjoyed for generations to come. jonathan vigliotti, cbs news, los angeles. >> he said it best. the birds are the can aree in the coal mine. straight ahead, a new generation of afghan women take the field with big goals in mind.

>> diaz: this week afghanistan votes for a new president. the election comes with taliban violence surging. and whoever wins will be in charge of attempting to negotiate first a ceasefire, and then some form of shared government. that could undermine gains made by afghan women-- not just at the ballot box, but on the playing field. charlie d'agata in kabul has the story. >> reporter: for these young women in kabul, soccer has never been just a game. >> actually when i play football i feel that i'm free in a country like afghanistan. >> reporter: when you play soccer it makes you feel free. >> yeah. >> reporter: but that freedom is now under threat. women here fear their hard-won liberties will be sidelined in any taliban negotiations inviting a return to a dark past. under taliban rule, women weren't even able to leave the house without a male companion. they couldn't even go to the doctor's by themselves. the idea of young women playing

soccer here in kabul would have been unthinkable. former m.p. fawzia koofi was an aspiring medical student when the taliban overran kabul. >> they have banned education and universities for all girls, the city was breathing but it was like a graveyard, that >> reporter: she says she had lost hope. until 9-11 changed everything. >> i'm sorry to say this, but what happened in 11 september was beginning of somehow a liberty to the women in afghanistan. because at least you could walk, after the taliban collapse, without the fear of being beaten up by taliban. >> reporter: koofi is still leading the charge for afghan women-- the right to study, to govern and yes, play soccer. >> we want to show to the people of the world that we are the new generation of afghanistan. >> reporter: and that's one goal worth fighting for.

charlie d'agata, cbs news, kabul. >> diaz: a goal worth fighting for indeed. when the cbs weekend news returns we'll take you on a tour of a treasured national monument that reopened after being closed for years.

>> diaz: we end with news out of washington that every american can celebrate. tourists lined up this weekend to get to the top of one of the nation's most cherished landmarks. as major garret reports, it's been closed for repairs for three years. >> reporter: the washington monument-- a 555 foot symbol of american unity-- beckons visitors from across the world, but for nearly a decade it's been closed more than open. interior secretary david bernhardt. why did it take so long? >> we're dealing with one of the most historic and iconic properties in our country and so it takes time to do everything right. >> reporter: the 2011 virginia earthquake shook the monument to its core, cracking stones and

showering debris onto scattering tourists. >> the big fear was that either the monument itself would fall or literally large pieces of rock would be coming off the monument. >> reporter: inspectors later rappelled down the monument before scaffolding wrapped the monument during repairs. >> that crack goes all the way through. >> reporter: but just as those repairs were completed, the elevator broke, sometimes stranding visitors. another round of upgrades delivered a new security screening center. and a whisper-quiet elevator that takes you to the top in about a minute. the whole project took about three years. >> reporter: from the observation deck the national mall reveals its geometric beauty, one window at a time. it's kind of breathtaking. >> it's really is spectacular. >> reporter: a spectacular view, for all to share once again. major garrett, cbs news, atop the washington monument. >> diaz: that's the "cbs weekend news" for this sunday. "60 minutes" is coming up. i'm adriana diaz reporting from new york. for all of us at cbs news, good

night. >> we asked everyone to be prepared to go without power for 48 hours or more. we are on fire watch as the danger grows, pg&e is gearing up for our down. an arrest that shattered windows and nerves on the san jose campus. one east the puzzle police are still looking for. it has been a rough year for fans, but hope is high and people are throwing around a word we have not heard in quite some time. >> playoffs, here we come. we begin on the fire watch and danger is expected to dramatically rise here. >> we have warnings from pg&e.

what is ahead? when weather looks like it has the two ingredients for fire concern, the national weather service issues a red flag warning. everywhere on the map has it and you can see this is most of the area surrounding the bay area. as is so often the case, they call out parts that will feel this more than others. i want to focus on the hills and mountains here starting monday night at 9 pm and going through wednesday morning, gusts up to 40 miles per hour and humidity levels down to the 20s. let me show you how this is going to change. we are going to start out at midnight, the green on the map is better humidity. watch what happens and watch the shades of brown fill the map by the time we get to the afternoon. now it is up to 17%, that is the first problem. the humidity is