from the tisch wnet studios at lincoln center in new york, william brangham. >> brangham: good evening, and thanks for joining us. donald trump says he must win the battleground state of pennsylvania to win the white house, but opinion polls show he has an uphill climb. trump is down by about ten percentage points to hillary clinton in the four most recent surveys of pennsylvania voters, yet he told supporters in altoona last night, he fears voter fraud could propel clinton to victory in the keystone state. >> she can't beat what's happening here. the only way they can beat it, in my opinion-- and i mean this 100%-- if in certain sections of the state, they cheat, okay? >> brangham: there's been no evidence of widespread in-person voter fraud in pennsylvania or any other state. hillary clinton returns to pennsylvania monday to campaign with vice president joe biden in his home town of scranton. hillary and bill clinton released their joint 2015 tax return yesterday, revealing the couple earned $10.6 million last year, mostly from speeches and book royalties, and paid an effective feder

william brangham has our encore look. >> reporter: the documentary is called "screenagers," and in ity ruston explores the complex relationship teenagers have with their screens. both the pleasures they take in sharing their lives online, with their friends, as well as the darker side: those who lose control of their digital habits, and spiral into damaging behavior. >> i hugged him and felt the bones sticking out of his back. >> reporter: the film also profiles the latest research about the impact all this screen-time has on the brains of young people: >> you have a brain that is wired for what in psychology is called seeking behavior, the kind of thing that a googlend search gives you. something new, somethingg stimulating, something different. >> reporter: throughout the film, ruston also turns the camera on herself, exploring the real and all-too-common conflicts that flare up as she and her family haggle over screen time. h what should the rules be because we don't have any now. >> i think the rules should be a rule, like i'm not on it 24-7. >> when we had it, you werere always c

i'm william brangham. good night.captioning sponsored by wnet captioned by media access group at wgbh access.wgbh.org >> pbs newshour weekend is made possible by: bernard and irene schwartz. judy and josh weston. the cheryl and philip milstein family. the john and helen glessner family trust. supporting trustworthy journalism that informs and inspires. sue and edgar wachenheim, iii. barbara hope zuckerberg. corporate funding is provided by mutual of america-- designing customized individual and group retirement products. that's why we are your retirement company. and by the corporation for public broadcasting, and by contributions to your pbs station from viewers like you. thank you. [jazz plays] man: it's called "the movie palace," and it's sort of like a little temple. it's almost like a religious shrine to the movies. these are like sort of depictions of different movie genres. this would be like the epics, "ben hur" type movie. this is sort of film noir. egg shell up here. this is actually chicken egg shells. thes

william brangham has the story. >> brangham: this is the clock tower where horror rained down fifty yearsay. bells rang to remember the lives lost, and to honor the survivors of the shooting at the university of texas in austin. ( bagpipes "taps" ) the flags on the campus mall were lowered to half-staff. the clock tower was stopped for 24 hours. bagpipes led mourners to the tower's garden, where a new memorial was dedicated to victims of the horrific event. it was on a hot august day in 1966 that former marine and engineering student charles whitman climbed to the top of the clock tower and opened fire. whitman killed fourteen people on campus that day, and had also murdered his wife and mother before his shooting spree began. more than thirty people were wounded, and a 17th victim died decades later of wounds sustained that day. whitman's rampage fifty years ago lasted an hour and a half, and only ended after police stormed the tower and killed him. other students had also fired at whitman with their own rifles. texas congressman lloyd doggett was a student on campus that day. >> this ma

william brangham has the story. >> brangham: on his first day in office, president obama promises to close guantanamo. he's called it expensive, unnecessary and a "recruitment brochure" for our enemies. while congress has blocked the transfer of high-risk detainees to u.s. prisons, the administration has focused on moving those who are cleared fon release to other nations. but monday's announcement, which was the single biggest transfer for this administration, has been criticized by republicans who say these 15 men are dangerous and should never havem been let go. i'm joined now by charlie savage of the "new york times."he he's covered gitmo and the war on terror for many years. charlie, help us understand, who are these 15 men who were recently released. >> hi. thanks for having me on. ure so these men, these 15, 12 of them are from yemen and 3 of them are from afghanistan. they were approved for transfer to a stable country that could provide various security assurances some time ago in many cases, either by a task force in 2009 or later by a parole-like review panel, in both case

william brangham has our update. >> reporter: this ruling is the second setback in recent weeks for transgenderocates. earlier this month, the supremes court said a virginia school board could block a transgender student from using the boyssi bathroom, while the higher court decides if it'll take up thes broader case. yesterday's decision is the first to say that the obama administration's directive could be blocked nationwide. those directives instructed school districts to allow trans students to use the bathroom of their choice. texas was one of 13 statesof challenging the constitutionality of the directive. in this case the judge wrote that the administration hadis exceeded its authority under title nine, the 1970s-era law banning sex discrimination in schools. to help us wade through the meaning of this i'm joined now by evie blad of "education week," who's been covering this story. so, evie, what does this ruling say and how significant is thiss >> it's very significant in that it's the first time we've heard a federal court weigh in on a nation-wide basis. there are several cases winding

william brangham has the latest on these rulings. >> brangham: voting rights supporters have won a seriesremarkable victories in the last few weeks. what they contend is a much needed push-back against what they say are discriminatory voter-i.d. laws. since 2008, ten states-- almost all governed by republican legislatures-- have passed laws tightening the requirements for the kind of i.d. you need in order to vote, or made other changes to when and how votes get cast. but several federal courts have now ruled that some of thoseno laws are discriminatory. on monday, a federal judge blocked north dakota's voter- i.d. law, saying it impinged on the rights of native americans. the judge wrote: "no eligible voter, regardless of their station in life, should be denied the opportunity to vote." last friday, a federal court ruled that north carolina's new voting laws had been intentionally designed to discriminate against minorities, saying these "new provisions target african-americans with almost surgical precision." and then in july, another court ruled that texas' voter-i.d. laws also hurt mi

william brangham brings us the latest. >> reporter: it's called the "blue-cut" fire and it's wreakingavoc in southernso california. the massive blaze closed major roadways like part of interstate-15 that connects los angeles and las vegas. and last night, officials issued evacuation orders for more than 34,000 homes-- that's some 82,000 people. >> i think this is the worstst that i've ever seen, you know. and it's kind of getting used to the idea of being homeless. >> reporter: the fire erupted yesterday, in the cajon pass, a critical corridor just north of san bernardino, only 60 miles from los angeles. it quickly expanded to more than 45 square miles. ten air tankers, 15 helicopters and some 1,300 firefighters were deployed within 24 hours. they faced hot, windyey conditions. >> the fuels are extremely dry and very explosive this time of year. and in my 40 years of fighting fire, i've never seen fire behavior so extreme as it was yesterday. >> i was able to get up this morning and get some eyes on it from the air. in a word, it was devastating. a lot of homes lost yesterday. there'l

william brangham has more. >> reporter: the a.p. went through a sampling of the tens of thousands of documents wikileaks released in the last year and found many personal details about private citizens-- social security numbers, medicar files, and sensitive family and financial information. in what the a.p. calls "particularly egregious,"ou wikileaks published the names of two teenage rape victims, as well as the name of a saudi citizen who'd been arrested for being gay. that revelation could endanger the man's life because, in saudi arabia, being gay is punishable by death. joining me now from paris is raphael satter, one of the a.p.a reporters who wrote this story. raphael, thanks for being here. i wonder if you could tell us, what made you first off want to do this deep dive into wikileakse in the first place? >> i covered the saudi files released back in 2015, and there was an enormous amount of newsworthy information in there, but as we were going through the files with my colleague who cowrote today's story, weo noticed that t

william brangham has the story. >> brangham: as the flood waters start to recede, the hard work h ofsessing and rebuilding begins. >> basically we lost everything, you know, other than our lives. couple of hours, we probably hab six-foot water. water is probably one of the worst mother nature beasts there is. >> brangham: an estimated 40,000 homes were damaged in the flooding that inundated baton rouge and lafayette, killing ate least 13 people. homeland security secretary jeh johnson got a first hand look today. >> the federal government is here. we have been here. we will be here as long as it takes to help this community recover. >> brangham: 4,000 people are>> still living in shelters acrosse the state. >> this is the largest operation that the american red cross has responded to since 2012, superstorm sandy, and driving s around the affected area, it's really devastating. >> brangham: in the most damaged areas, only about one out of every eight homes is covered byi flood insurance, because these areas weren't considered likelyr to flood. >> no one was expecting this. this is, i