Tarrant County (TX) Sheriff Bill Waybourn doffs his cap as he is introduced by Acting Director of U.S. Immigration and Customs Enforcement (ICE) Matthew Albence before briefing reporters at the White House in Washington, U.S. October 10, 2019. REUTERS/Jonathan Ernst

Aletschhorn mountain and Mittelaletsch glacier are pictured with The Great Aletsch glacier down below at Eggishorn mountain, in Fiesch, Switzerland July 31, 2019. Picture taken July 31, 2019. REUTERS/Catherine Muzolf

The Great Aletsch glacier is pictured at Eggishorn mountain, in Fiesch, Switzerland July 31, 2019. Picture taken July 31, 2019. REUTERS/Catherine Muzolf

Aletschhorn mountain and Mittelaletsch glacier are pictured with The Great Aletsch glacier down below at Eggishorn mountain, in Fiesch, Switzerland July 31, 2019. Picture taken July 31, 2019. REUTERS/Catherine Muzolf

A black-capped squirrel monkey eats iced treats with nuts and berries during the hot weather at London Zoo in London, Britain, June 27, 2018. REUTERS/Toby Melville

Black-capped squirrel monkeys eat iced treats with nuts and berries during the hot weather at London Zoo in London, Britain, June 27, 2018. REUTERS/Toby Melville

Black-capped squirrel monkeys eat iced treats with nuts and berries during the hot weather at London Zoo in London, Britain, June 27, 2018. REUTERS/Toby Melville

Black-capped squirrel monkeys eat iced treats with nuts and berries during the hot weather at London Zoo in London, Britain, June 27, 2018. REUTERS/Toby Melville

Snow capped mountains are reflected in Loch Fyne, as seen from Inveraray, Scotland, Britain, December 11, 2017. REUTERS/Russell Cheyne

Snow capped mountains are reflected in Loch Fyne, as seen from Inveraray, Scotland, Britain, December 11, 2017. REUTERS/Russell Cheyne

Snow capped mountains are reflected in Loch Fyne, as seen from Inveraray, Scotland, Britain, December 11, 2017. REUTERS/Russell Cheyne

The mountain Buachaille Etive Mor is reflected in the slow flowing river Coupall near Ballachulish, Scotland, Britain November 30, 2017. REUTERS/Russell Cheyne

A winter swimmer swims after breaking the ice on a frozen lake at a park in Shenyang, China, December 9, 2016. REUTERS/Sheng Li TPX IMAGES OF THE DAY

Mountains are seen covered with snow near the village of Valmeinier in the Rhone-Alpes region, France, March 20, 2016. REUTERS/Yves Herman

The Matterhorn mountain is pictured in Zermatt, Switzerland, March 15, 2015. The remains of two young Japanese climbers missing on the Matterhorn mountain since a 1970 snow storm in the Swiss Alps have been identified through DNA testing of their relatives, police said on Thursday. Human bones spotted by a climber last September on a shrinking glacier at an altitude of 2,800 meters were sent to the medical examiner for identification, cantonal (state) police in the Valais said. Picture taken March 15, 2015. REUTERS/Denis Balibouse

Black-capped squirrel monkeys eat blocks of ice at the zoo on a hot summer day in Antwerp, Belgium, July 2, 2015. The United Nations warned on Wednesday of the dangers posed by hot weather, especially to children and the elderly, as much of Europe sweltered in a heatwave whose intensity it blamed on climate change. REUTERS/Yves Herman

Black-capped squirrel monkeys eat blocks of ice at the zoo on a hot summer day in Antwerp, Belgium, July 2, 2015. The United Nations warned on Wednesday of the dangers posed by hot weather, especially to children and the elderly, as much of Europe sweltered in a heatwave whose intensity it blamed on climate change. REUTERS/Yves Herman

Vladimir Korabelnikov, head of a local orphanage and a member of local winter swimming club, warms up on the bank of the Yenisei River ahead of his weekly bathing session, with the air temperature at about minus 20 degrees Celsius (minus 4 degrees Fahrenheit), in the town of Divnogorsk near Krasnoyarsk, Siberia, February 20, 2015. REUTERS/Ilya Naymushin (RUSSIA - Tags: SOCIETY ENVIRONMENT TPX IMAGES OF THE DAY)

A church made entirely from ice is seen during the night at Balea Lac resort in the Fagaras mountains January 29, 2015. REUTERS/Radu Sigheti (ROMANIA - Tags: ENVIRONMENT SOCIETY RELIGION TRAVEL TPX IMAGES OF THE DAY)

A general view of the Swiss mountain resort of St. Moritz January 24, 2015. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: CITYSCAPE SOCIETY ENVIRONMENT TRAVEL)

The sunset illuminates the peaks of the mountains near the Swiss mountain resort of St. Moritz January 24, 2015. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: SOCIETY ENVIRONMENT TRAVEL)

The sunset illuminates the peaks of the mountains near the Swiss mountain resort of St. Moritz January 24, 2015. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: SOCIETY ENVIRONMENT TRAVEL TPX IMAGES OF THE DAY)

A swimmer reacts after finishing his competition in a pool carved into thick ice covering the Songhua River during the Harbin Ice Swimming Competition in the northern city of Harbin, Heilongjiang province January 5, 2015. The swimming competition was held on the official launch day of the Harbin International Ice and Snow Sculpture Festival. REUTERS/Kim Kyung-Hoon (CHINA - Tags: SPORT SWIMMING TRAVEL SOCIETY ENVIRONMENT TPX IMAGES OF THE DAY)

Skiers make their way down a slide during the first sunny day in 2015 in the Tyrolean ski resort of Seefeld January 1, 2015. REUTERS/Leonhard Foeger (AUSTRIA - Tags: ENVIRONMENT)

Roped parties of climbers walk on a glacier marking the border with Switzerland (left) and Italy on the way to the summit of the Breithorn at 4,164 metres (13,661 feet) in the Alpine resort of Zermatt August 4, 2014. Switzerland will vote on November 30 on an initiative from the group Ecopop which proposes a cap on the number of immigrants. The group says it is motivated by concerns about a lack of living space exerting too much pressure on the land and natural resources, rather than by opposition to foreigners. It proposes limiting immigration to just 0.2 percent of the resident population, equivalent to 16,000 people per year. This would represent a cut of more than 75 percent in annual net immigration from current levels. In Switzerland's system of direct democracy, any voter can trigger a referendum by collecting 100,000 signatures within 18 months. REUTERS/Denis Balibouse (SWITZERLAND - Tags: POLITICS ELECTIONS ENVIRONMENT SOCIETY IMMIGRATION TPX IMAGES OF THE DAY)

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Fog covers the Inntal valley in front of snow covered mountain summits in Tulfes Ocotber 24, 2014, following the first snowfall of the season the previous day. REUTERS/Dominic Ebenbichler (AUSTRIA - Tags: ENVIRONMENT TPX IMAGES OF THE DAY)

The moon illuminates the snow-covered Concordia, the confluence of the Baltoro and Godwin-Austen glaciers, near the world's second highest mountain the K2 (8,000 meters) in the Karakoram mountain range in Pakistan September 6, 2014. While other parts of Pakistan and northern India were flooded, Concordia in the Karakoram mountain range was covered with a seasonally unusual amount of snow. Geographically, Pakistan is a climbers paradise. It rivals Nepal for the number of peaks over 7,000 meters and is home to the world's second tallest mountain, K2, as well as four of the world's 14 summits higher than 8,000 meters. In more peaceful times, northern Pakistan's unspoilt beauty was a major tourist draw but the potentially lucrative industry has been blighted by years of violence. The number of expeditions has dwindled, wrecking communities dependant on climbing for income and starving Pakistan's suffering economy of much-needed dollars. Picture taken September 6, 2014. REUTERS/Wolfgang Rattay (PAKISTAN - Tags: ENVIRONMENT SOCIETY TPX IMAGES OF THE DAY TRAVEL)

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The Yakutat Glacier feeds into Harlequin Lake near Yakutat, as seen during a flight over southeastern Alaska October 7, 2014. REUTERS/Bob Strong (UNITED STATES - Tags: ENVIRONMENT TRAVEL)

Lake Louise is pictured at Banff National Park, in the Canadian Rocky Mountains outside the village of Lake Louise, Alberta, October 3, 2014. REUTERS/Mark Blinch (CANADA - Tags: ENVIRONMENT SOCIETY)

Llamas graze with Ecuador's Mount Chimborazo in the background July 18, 2014. Chimborazo is the highest mountain in Ecuador with a peak elevation of 6,268 metres (19.685 ft). Due to a bulge around the equator Chimborazo's summit is the farthest point on the Earth's surface from the Earth's centre. REUTERS/ Guillermo Granja (ECUADOR - Tags: TRAVEL ENVIRONMENT SOCIETY)

Canada's goalie Genevieve Lacasse adjusts her cap during their women's ice hockey team practice ahead of the 2014 Sochi Winter Olympics February 7, 2014. The women's ice hockey competition begins on February 8. REUTERS/Laszlo Balogh (RUSSIA - Tags: SPORT OLYMPICS ICE HOCKEY)

Bee hives are seen surrounded by ice-covered broken trees in Rakitnik February 4, 2014. REUTERS/Srdjan Zivulovic (SLOVENIA - Tags: ENVIRONMENT TPX IMAGES OF THE DAY)

Ice covers a fence during sunny winter weather on the peak of Mount Rigi at 1,797 m (5,896 ft) above sea level, near Lake Lucerne December 7, 2013. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: ENVIRONMENT TPX IMAGES OF THE DAY)

A chapel is seen on a sunny autumn day in front of snow covered mountains in the wetsern Austrian village of Rum October 15, 2013. REUTERS/Dominic Ebenbichler (AUSTRIA - Tags: ENVIRONMENT TPX IMAGES OF THE DAY)

A stream of glacial meltwater flows from Huascaran, Peru's tallest mountain, in Huascaran National Park in Huaraz, September 18, 2013. The nearby Pastoruri glacier is one of the fastest receding glaciers in the Cordillera Blanca mountain range according to a 2012 paper by the University of Texas and the Huascaran National Park. Peru is home to 71% of the world’s tropical glaciers, which are a source of fresh water for millions, but 22% of the surface area of Peruvian glaciers has disappeared in the past 30 years alone, according to The World Bank. Picture taken September 18, 2013. REUTERS/Mariana Bazo (PERU - Tags: ENVIRONMENT TRAVEL)

Australian Wallabies rugby player Christian Leali'ifano successfully kicks a conversion of teammate Adam Ashley-Cooper's 75th minute try during the second test match against the British and Irish Lions in Melbourne June 29, 2013. Leali'ifano is hoping the decisive test against the British and Irish Lions on July 6, 2013, does not come down to a final kick, but if it does the ice-cool Wallaby will go about it as if he was a kid in his own backyard. The kick, that gave the Wallabies a 16-15 victory to level up the series, also gave Leali'ifano a flawless four from four record and capped a superb night for the 25-year-old in what was effectively his debut after a concussion ended his first test in the first minute of the 23-21 defeat in Brisbane. Picture taken June 29, 2013. REUTERS/David Gray (AUSTRALIA - Tags: SPORT RUGBY)

Emile Poirier tries on a Calgary Flames jersey and cap after being selected by the Flames as the 22nd overall pick in the 2013 National Hockey league (NHL) draft in Newark, New Jersey, June 30, 2013. REUTERS/Brendan McDermid (UNITED STATES - Tags: SPORT ICE HOCKEY)

Curtis Lazar poses in an Ottawa Senators jersey and cap after being selected by the Senators as the 17th overall pick in the 2013 National Hockey league (NHL) draft in Newark, New Jersey, June 30, 2013. REUTERS/Brendan McDermid (UNITED STATES - Tags: SPORT ICE HOCKEY)

Curtis Lazar tries on an Ottawa Senators jersey and cap after being selected by the Senators as the 17th overall pick in the 2013 National Hockey league (NHL) draft in Newark, New Jersey, June 30, 2013. REUTERS/Brendan McDermid (UNITED STATES - Tags: SPORT ICE HOCKEY)

Alexander Wennberg from Sweden poses in a Columbus Blue Jackets jersey and cap after being selected by the Blue Jackets as the 14th overall pick in the 2013 National Hockey league (NHL) draft in Newark, New Jersey, June 30, 2013. REUTERS/Brendan McDermid (UNITED STATES - Tags: SPORT ICE HOCKEY)

Alexander Wennberg (C) from Sweden poses in a Columbus Blue Jackets jersey and cap after being selected by the Blue Jackets as the 14th overall pick in the 2013 National Hockey league (NHL) draft in Newark, New Jersey, June 30, 2013. REUTERS/Brendan McDermid (UNITED STATES - Tags: SPORT ICE HOCKEY)

Max Domi tries on a Phoenix Coyotes jersey and cap with team executives after being selected by the Coyotes as the 12th overall pick in the 2013 National Hockey league (NHL) draft in Newark, New Jersey, June 30, 2013. REUTERS/Brendan McDermid (UNITED STATES - Tags: SPORT ICE HOCKEY)

Max Domi tries on a Phoenix Coyotes jersey and cap with team executives after being selected by the Coyotes as the 12th overall pick in the 2013 National Hockey league (NHL) draft in Newark, New Jersey, June 30, 2013. REUTERS/Brendan McDermid (UNITED STATES - Tags: SPORT ICE HOCKEY)

Josh Morrissey poses in a Winnipeg Jets jersey and cap after being selected by the Jets as the 13th overall pick in the 2013 National Hockey league (NHL) draft in Newark, New Jersey, June 30, 2013. REUTERS/Brendan McDermid (UNITED STATES - Tags: SPORT ICE HOCKEY)

Josh Morrissey poses in a Winnipeg Jets jersey and cap after being selected by the Jets as the 13th overall pick in the 2013 National Hockey league (NHL) draft in Newark, New Jersey, June 30, 2013. REUTERS/Brendan McDermid (UNITED STATES - Tags: SPORT ICE HOCKEY)

Josh Morrissey stands in a Winnipeg Jets jersey and cap after being selected by the Jets as the 13th overall pick in the 2013 National Hockey league (NHL) draft in Newark, New Jersey, June 30, 2013. REUTERS/Brendan McDermid (UNITED STATES - Tags: SPORT ICE HOCKEY)

Josh Morrissey tries on a Winnipeg Jets jersey and cap after being selected by the Jets as the 13th overall pick in the 2013 National Hockey League (NHL) draft in Newark, New Jersey, June 30, 2013. REUTERS/Brendan McDermid (UNITED STATES - Tags: SPORT ICE HOCKEY)

Valeri Nichushkin of Russia tries on a Dallas Stars jersey and cap after being selected by the Stars as the tenth overall pick in the 2013 National Hockey league (NHL) draft in Newark, New Jersey, June 30, 2013. REUTERS/Brendan McDermid (UNITED STATES - Tags: SPORT ICE HOCKEY)

Bo Horvat tries on his Vancouver Canucks jersey and cap after being selected by the Canucks as the ninth overall pick in the 2013 National Hockey league (NHL) draft in Newark, New Jersey, June 30, 2013. REUTERS/Brendan McDermid (UNITED STATES - Tags: SPORT ICE HOCKEY)

Seth Jones tries on a Nashville Predators jersey and cap after being selected by the Predators as the fourth overall pick in the 2013 National Hockey league (NHL) draft in Newark, New Jersey, June 30, 2013. REUTERS/Brendan McDermid (UNITED STATES - Tags: SPORT ICE HOCKEY)

NHL draft prospects for 2013, (wearing Yankees caps from - R) Nathan MacKinnon, Seth Jones and Darnell Nurse speak to members of the media on the observation deck of the Empire State Building in New York, June 27, 2013. The NHL will hold its annual draft in Newark, New Jersey on Sunday. REUTERS/Brendan McDermid (UNITED STATES - Tags: SPORT ICE HOCKEY)

A general view from Germany's highest mountain the 2,962 metre (9,718 feet) Zugspitze, shows fog covered mountain summits on a sunny Spring day in the Bavarian village of Grainau April 3, 2012. REUTERS/Dominic Ebenbichler (GERMANY - Tags: ENVIRONMENT CITYSPACE)

People ride down a public sledge course during a sunny winter weather day at the Muottas Muragle mountain 2546 metres (8058 feet) altitude near the Swiss mountain resort of St. Moritz January 31, 2013. The people of the canton of Grisons will vote about a possible bid of the mountain resorts of Davos and St. Moritz for the 2022 Winter Olympic Games. Picture taken on January 31, 2013. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: SPORT OLYMPICS ENVIRONMENT SOCIETY)

A man climbs up an artificially made wall of ice near the Swiss mountain resort of Pontresina January 28, 2013. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: SPORT SOCIETY TPX IMAGES OF THE DAY) FOR BEST QUALITY IMAGE: ALSO SEE GF2E9710T0F01

A general view from atop of the 1838 metres (6030 feet) high Wendelstein mountain with the Alps and surrounding mountains in the background on January 8, 2013. REUTERS/Michael Dalder(GERMANY - Tags: SOCIETY ENVIRONMENT)

A general view from top of the 1838 metres (6030 feet) high Wendelstein mountain shows the Alps and surrounding mountains on January 8, 2013. REUTERS/Michael Dalder(GERMANY - Tags: SOCIETY ENVIRONMENT)

Snow-covered mountains look over the Isfjord in Svalbard, June 1, 2012. The Svalbard archipelago on Europe's northern edge is probably the remotest and wildest place in the Arctic with regularly scheduled flights, so get there quick before the crowds discover its crystal clear waters, glaciers and wildlife. Picture taken June 1, 2012. To match story TRAVEL-SVALBARD/ REUTERS/Balazs Koranyi (NORWAY - Tags: TRAVEL SOCIETY)

Jacob Trouba, dressed in his new jersey, adjusts his cap after being picked by the Winnipeg Jets in the first round of the NHL draft in Pittsburgh, Pennsylvania, June 22, 2012. REUTERS/Jason Cohn (UNITED STATES - Tags: SPORT ICE HOCKEY)

Actor Will Ferrell (red cap) sits in the crowd watching the Los Angeles Kings play the Vancouver Canucks during Game 3 of their NHL Western Conference Hockey playoff quarter-finals in Los Angeles, California April 15, 2012. REUTERS/Danny Moloshok (UNITED STATES - Tags: SPORT ICE HOCKEY ENTERTAINMENT PROFILE)

A sign marks the position of the glacier tongue of the Morteratsch glacier in the year of 2010 near the Swiss mountain resort of Pontresina March 11, 2012. The sign reads 'Position of glacier tongue 2010. Reduction since 1900 = 2185 metres/7168 feet'. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: ENVIRONMENT)