captioning sponsored by wnet >> on this edition for sunday, august 21: with most national polls showing hillary clinton preferred by 5 percent more voters than donald trump, trump tries to get back on track. a terrorist attack in turkey, allegedly carried out by a child bomber, kills more than 50 people. and in our signature segment the lionfish "invasion" in the atlantic coast of florida and beyond. next on "pbs newshour weekend." >> 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. additional support has been provided by: and by the corporation for public broadcasting, and by contributions to your pbs station from viewers like you. thank you. from the tisch wnet studios at lincoln center in new york, this is pbs newshour weekend. good evening and thanks for joining us. national polls show hillary clinton dominant with african- american and latino voters but donald trump is making his case. at a rally in virginia last night, the republican candidate reiterated his recent pledge to reach out more to black voters. >> the gop is the party of

abraham lincoln. (cheers) and i want our party to be the home of the african- american voter once again. ( cheers ) also, trump may be shifting his tone on immigration, according to participants in yesterday's first meeting of what he calls his "national hispanic advisory council." trump reportedly asked for input from the council's two dozen faith and business leaders and former government officials ahead of his immigration speech in colorado this thursday. today on cnn, trump campaign manager kellyanne conway said the candidate's pledge to create a new police force to deport undocumented immigrants is not a certainty. >> will that plan include a deportation force? >> to be determined. new filings with the federal election commission reveal clinton's campaign had $58 million cash on hand at the start of august compared to $38 million for trump.

clinton's campaign also spent about double what trump's campaign spent in july, particularly on tv ads. facing questions about its funding and potential conflicts of interest, the clinton family's foundation has announced it will no longer accept corporate and foreign donations. if hillary clinton wins the presidential election. her campaign manager, robby mook, explained why earlier today on abc. >> look, what the foundation is saying is that they don't want to become a distraction; they want to go as far as they possibly can to avoid any conflict of interest. hillary clinton had no public events this weekend but held fundraisers today in atlanta, georgia, and in provincetown, massachusetts, where she was joined by entertainer cher. at least 105 residences and 213 other buildings have been destroyed in the so-called "blue cut" fire that burned through 58 square miles of southern california mountain communities in the past week. the fire is now 73% contained, but six other wildfires are burning in the state.

as newshour weekend's mori rothman reports, the constant alarms take a toll on firefighters. >> reporter: battalion chief mike brown has been fighting fires in california for 26 years. but he's never seen a fire quite like "the blue cut fire" in southern california's san bernardino county, 60 miles east of los angeles. >> it was like an angry fire. these were 50 to 100 foot flame lengths, and i was just amazed to see the volume of the fire. >> reporter: in an ever lengthening wildfire season, brown is dispatched to fires like this more often-- for days at a time. this is his second wildfire in two weeks. >> fires are year round, and we've kind of come to the point that we understand that it's a year round fire season for us. >> reporter: california's wildfire season traditionally began in the summer, when vegetation dried out, and forests became more flammable. but five years of drought and hotter than average temperatures, have shrunk the break between one year's fire season and the next.

drier conditions also contribute to the rapid spread and destructiveness of the fires. what makes a fire like this so dangerous? >> the reason why it's so dangerous is the intensity that it's burning. the vegetation was very dense. we had 70 year brush that hadn't been burned. no fire history in this area. everything was in alignment. >> reporter: volatile conditions like those in the "blue cut fire" are becoming more common in other parts of the state-- like the "cedar fire" at sequoia national forest last week. thousands of firefighters have been battling massive wildfires across california this summer, and experts warn this year could be worse than ever. that's because drought, intense heat and tree-eating beetles are causing a dramatic rise in the number of dead trees, turning forests like this one into a tinderbox. paul gibbs is a spokesman for the u.s. forest service. >> we've never seen anything at this level and this type of mortality in recorded history

that we have. to have 50% to 75% of your forest and dead trees, that's unprecedented. >> reporter: last week, gibbs deployed to the "cedar fire" in central california to study how the dried out trees fueled the blaze. he says the weather pattern "el nino"-- which typically means wetter conditions for northern and southern california-- mostly missed central california. with less rain, grasses and logs dried up earlier in the summer, creating more tinder for fires. people thought maybe el nino would make this year's wildfire season a little calmer. has that been the case? >> no, no, we're seeing just the opposite. we did get a pulse of rain, so we have a very healthy grass crop this year. but as we get temperatures in the 90s and over 100, 105, the grass dies. then you have a combination of the dry grass, which will carry fire and start fires a lot easier. >> reporter: gibbs is looking for that combination of dry grass and dead trees-- hoping to

anticipate where the next big wildfire might spark. >> i think we're in store for a pretty active fall. but we've already got folks who've been out for a few days and have to start worrying about fatigue of firefighters, and really pace ourselves because then you realize this is a more like marathon race than a sprint. >> reporter: a marathon that's become the new normal for firefighters like mike brown. >> we've had numerous fires over the last few months. we have crews coming off of fires, you know coming on to this fire. so crews are taxed we have families that are taxed, so it's been cumbersome not only for firefighters but their families as well. >> stewart: turkey's president, recep erdogan, is blaming today's terrorist attack near the turkish-syrian border on a suicide bomber who was between 12 and 14 years old. the attacker set off the explosion at a wedding reception in gaziantep, targeting guests dancing in the streets as the

party was ending. at least 51 people were killed and 69 others wounded, including the groom, though the bride was unhurt. president erdogan said the islamic state, or isis, planned the attack, the deadliest in a series of bombings in turkey this year. the white house called the attack "barbaric" and" cowardly," and said vice president biden will discuss the fight against terrorism during his visit to turkey this week. iraq has carried out a mass execution of militants convicted of a massacre of iraqi soldiers in 2014. iraqi officials say 36 isis militants were hanged today at a prison in the southern city of nasiriya. they were arrested last year when iraqi troops retook the city of tikrit. that's where the militants killed as many as 1,700 iraqi soldiers, after isis seized the city. the iraqi soldiers were shot to death after being made to lie face-down in a ditch. the philippines' new president, rodrigo duterte, is threatening to have his country leave the united nations. duterte called the u.n. useless

and "stupid" in a rambling, often obscene speech today, and criticized the human rights officials who urged him in a report three days ago to end extrajudicial killings of alleged drug traffickers. duterte has vowed to do whatever it takes to wipe out the drug trade. the u.n. says filipino police have killed 850 suspected traffickers and dealers since duterte took office two months ago. duterte said he isn't concerned about the repercussions of his remarks. the summer olympics in rio de janeiro end tonight, and along with that, for brazilians, a great distraction from a deep recession and the turmoil facing their government-- specifically dilma rousseff, the nation's president who was recently suspended from office. rousseff stands accused of violating budget laws by illegally moving money between state-controlled entities to make her government's budget deficit appear smaller than it really was. the impeachment trial begins this thursday in brazil's senate. joining me now by skype from rio to explain what to expect is" wall street journal" reporter

paolo trevsiani. >> and paulo can you explain to us what takes this from creative accounting to something illegal in brazil? >> so about 15 years ago, brazil created this law, this is called fiscal responsibility law, by which it is like what dilma rousseff is accused of doing, is became illegal and subject to impeachment. >> do her accusers say she did this on her own? how could she do this on her own? >> well, what the accusers say is it was her responsibility to make sure it didn't happen. even if her ministers or whoever was work in the government made the mistake, it was the accuse accusers, statement, dilma

rousseff's final responsibility to make sure it hasn't happened. >> she is going to testify in her own defense, what is her argument so far? >> she said everything she did was legal or at least it was based on precedent from previous presidents. the accusers say that the scale was much bigger than anything ever seen before. it does base that oil is down to politics at the end of the day, no matter how much legal arguments people toss around here and there. the final results is that president reuve rousseff lost political respect. she is going to testify, monday, the 29th, there are great expectations around it. it will be the first time she talks eye to eye with her accusers and we are all waiting to see any new revelations she's

going to deliver. >> stewart: in brazil, there are 81 senators, 54 i believe have to vote for impeachment for it to happen. what do you anticipate will happen? >> the forecast tip, this -- at this point, there coob 60 votes, six more than needed against rousseff. about 69 senators voted against her, so it's pretty likely that she's going to be ousted. >> stewart: and to give our viewers a little context, can you give us some background? >> this is the one of the major crises in history, a major

recession, brazil the economy has shrunk 3.8% last year and it's lining to shrink again 3 point something percept. 11.7 million brazillians are jobless and of course that is a major social problem with the economy, inflation is running high and there is also a major corruption problem, that is unfolding as we speak, and dozens of politician he are being accused of -- politicians are being accused of cruchtion, close close to rousseff even though she is not accused of anything in that corruption probe. but what we have for brazil is enormous cleanup job, for the next several years. >> paulo trevisani, from the wall street journal, thank you so much for joining us.

bls. >> my pleasure. a bangladeshi-american community in new york city wonders what comes next after the fatal shooting of an imam outside its mosque. w.pbs.com/newshour.ite at lionfish are now considered one of the world's most invasive species especially troublesome in the western atlantic ocean, the gulf of mexico, and the caribbean sea. the fast-breeding and ravenous lionfish are not native to these waters and are devouring indigenous fish, including those that maintain the health of coral reefs. in tonight's signature segment," newshour weekend" special correspondent yasmeen qureshi explains the problem and what's being done to stop it. >> reporter: florida's southern coast is one of the most popular dive spots in the world-- home to the only tropical coral reef in continental united states. hundreds of species of fish live along this reef system. but the fish here are in danger, because of a foreign predator that's been devouring them: lionfish.

eric nelson is an avid scuba diver who hunts lionfish up to a hundred and thirty feet below the surface of the atlantic ocean. >> they can eat 90% of their body weight, everyday, in fish. in fact, we have pictures of lionfish that have been gutted, and they have 50 small fish inside of them. >> reporter: nelson and his teammates are competing in a lionfish derby off the coast of boca raton, florida. it's a competition to catch as many lionfish as possible before sunset. the boat's captain paul varian is a commercial fisherman who's been diving these waters for 16 years. >> i saw my first lionfish seven, eight years ago, maybe. i remember going, "oh whoa! what's that? that's crazy." and now they're everywhere. there's so many of them. >> reporter: lionfish are native

to the south pacific and the indian ocean, and there are different theories about how they came to inhabit atlantic waters. the leading theory is that a few home aquarium owners set some lionfish free in the ocean in the 1980s, and the fish rapidly reproduced. several scientific studies have traced the dna for the entire lionfish population in the atlantic back to a small group of fish. when lionfish invade a reef, they can reduce the population of fish they eat, by 65 percent over two years, according to a study conducted in the bahamas. how much of a problem are lionfish to the reefs in this area? >> diving the same reefs over and over every year, you can actually really noticeably tell the difference between a reef that had lots of reef fish before lionfish invasion, and than devastatingly half as many reef fish. >> reporter: lionfish consume more than 100 species of fish,

including baby grouper and snapper. and fish that maintain the health of the reefs by grazing on algae. eric nelson says he's noticed that the hunts off the coast of florida are starting to make an impact. >> once we started actively hunting lionfish, we noticed that the same populations are coming back. >> reporter: during the past decade, lionfish have invaded the underwater habitats in the atlantic ocean, the gulf of mexico, and the caribbean. scientists expect that the lionfish invasion will continue to spread from north carolina to the southern tip of brazil. one reason for the rapid lionfish invasion is that they are fast breeders-- laying more than two million eggs every year. lad akins oversees the lionfish program for reef environmental education foundation, that is dedicated to marine conservation. >> the marine environment is a

very complicated, interconnected system and it's taken thousands of years for things to work its place out in balance. when you introduce a new piece to that puzzle, it disrupts the entire system. >> reporter: because lionfish are not native to the atlantic, they don't have natural predators here. akins says that when you combine that with their voracious appetites lionfish wreak havoc on underwater habitats. and, lionfish have been found as deep as 1,000 feet in the ocean. >> with the impacts that we're seeing in our shallow waters, we don't know how bad this is going to get. so our entire marine ecosystem is at risk. we could see extinction of some species of fish due to lionfish predation. we could see severe degradation to coral reef environments, if algae is not kept in check by the grazers, which lionfish are consuming. we could see impacts to commercial fisheries, to grouper snapper, shrimp, crabs. >> without natural lionfish predators here, the most

effective way to control the population is for divers to catch and kill them. but they're not easy to catch. they don't swim in large schools, and they have poisonous spines that can sting. >> this is safe, that's safe. they also have venom right on that one and that one, and then along pectoral there. the pain can be 50 times worse than a wasp sting. >> that's about an hour after being stung. that was in total, about a three month ordeal. >> reporter: the dive community has stepped up to find safe ways to catch lionfish. one diver designed this plastic cylinder that he calls a zookeeper to store lionfish underwater, and protect divers from being stung. nelson and his team use pole spears that he adapted to make

it easier to catch the fish. he calls them "lionfish slayers". >> what's great is that everybody is pitching in to address this. divers are going out and spending their time, and their money to go out and remove lionfish; governments are putting money and effort into researching better tools and techniques. >> reporter: florida's fish and wildlife conservation commission has been running a public awareness campaign about the lionfish threat and contributing prize money to derbies to catch them. as this lionfish derby comes to an end, the dive teams head back to the dock for weigh-in. lad akins' organization, reef, is one of the sponsors of the event. he says derbies can help scientists better understand the species. >> every individual lionfish that's collected is measured, because that information is very useful in looking at impacts and populations. and then samples are made available for researchers that are hoping to better understand lionfish. >> reporter: some fish is also donated to restaurants to create

a human appetite for lionfish. chef andres avayu at piccolo restaurant in fort lauderdale says his customers line-up for tables when the specialty item is on the menu. >> you could grill it, sauteé i, bake it- like it's flavor, it's really versatile in how preparation is done. there is no right, there is no wrong. it's one of those fish that just is. >> reporter: one of his favorite recipes, lionfish tacos. and fisherman have noticed that catching lionfish can be profitable. commercial fisherman paul varian, says demand is increasing. even whole foods sells them, when available. >> they've become a pretty big part of my income. the last year or so, everybody's finally figured out that the guys who buy them from us, the restaurants, the consumers, everybody likes them and it's worth it. everybody's making money and the consumer is happy at the end. so now, the price has gone up.

demand has gone way up. i have people calling me, i don't even know who they are, begging me to buy lionfish. and i'm like sorry, i'm just supplying the people i've been selling to for years. if i could shoot a thousand pounds a day i could sell it. >> reporter: as the results come in from the weigh-in at this derby, some people are tasting lionfish for the first time. >> i'm a scuba diver, and i've seen them underwater for a long time. and everybody has been telling it's a nice light, white, crispy fish, and a very mild flavor. >> reporter: lad akins says popularizing lionfish cuisine, may be the best way to control the problem. >> eradication is not on the table. lionfish are simply too widespread, too deep, too inaccessible in some areas for us, with our current tools and technologies, to remove every

last one. so what we're left with is having to keep de-weeding the garden. this is "pbs newshour weekend" sunday. >> sreenivasan: south africa's apartheid era-- when segregation was legal and the white minority ruled repressively-- is remembered as a time of rampant violence and divisiveness. this summer a new photo exhibit showcases the aspirations and private lives that some south africans carved out for themselves amidst the turmoil. "newshour weekend's" ivette feliciano has more. >> reporter: these photographs by s.j. "kitty" moodley are part of an exhibit called "who i am: rediscovered portraits from apartheid south africa," now at the walther collection project space in new york city. in 1957, after being fired from a shoe factory, moodley opened a studio in a working class area and served mostly "non-whites" like himself. in line with his political views-- that's moodley at a rally-- his studio in the 70s and 80s became a safe space for anti-apartheid activists.

>> it reminds me very much of african-american barbershops. >> reporter: columbia university professor steven dubin curated the exhibit and spoke to" newshour weekend" by skype from south africa. >> people can come, they can get news, they can share news, they can talk about ideas. you know, kitty's studio, you know, served the same function. >> reporter: while photojournalists often documented the protests and violence of the time, these photos tell a different story. >> even under the most restricted conditions people were able to fashion lives for themselves and perhaps they were able to imagine lives for themselves that did not exist before that. >> reporter: the 38 photos on display are often playful. a lady wearing a lampshade on her head. three men dancing. moodley also captured the bending of social norms. here a woman wears traditional zulu female attire, and then she's seen in pants typically worn by zulu men. according to dubin, dressing like that would have been considered daring. but moodley's studio allowed for self-expression during a turbulent time. he died in 1987-- seven years before apartheid collapsed.

these photos will be on display until september 3. >> stewart: finally on this last day of competition at the loiks the first u.s. marathon medal since 2004. 21-year-old clarissa shields man or woman to win two olympic gold medals and following in the footsteps of the men's team, beat serbia by 30 points for its third gold medal in a row. that's all for this edition ever pbs newshour weekend, i'm alison stewart, 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. additional support has been provided by: and by the corporation for public broadcasting, and by contributions to your pbs station from viewers like you. thank you.

narrator: just 20 years before the famine which ravaged ireland, and 20 years after the act of union, a wealthy anglo-irish landowner built a magnificent mansion. like many such houses, its story is intertwined with pivotal moments from ireland's own history and features some colorful characters. jim reynolds: for many people, his reputation was even worse than that of cromwell. kevin mulligan: the family took the very wise precaution of putting in a caretaker who had republican sympathies. john quinn: they were a decent bunch of men. they looked like kind of your uncles or country farmers kind of thing. the new owner was... he is a renaissance man really. narrator: for 100 years, ballyfin was a family home - a place to entertain and impress until dramatic events