Britain's opposition Labour Party leader Jeremy Corbyn is seen through an autocue during his speech about Labour's environment policies in Southampton, Britain November 28, 2019. REUTERS/Toby Melville 

U.S. President Barack Obama makes a point during his speech at the Stavros Niarchos Foundation Cultural Center in Athens, Greece November 16, 2016. REUTERS/Yannis Behrakis TPX IMAGES OF THE DAY 

U.S. President Barack Obama makes a point during his speech at the Stavros Niarchos Foundation Cultural Center in Athens, Greece November 16, 2016. REUTERS/Yannis Behrakis

Audience members wait to greet U.S. Democratic presidential nominee Hillary Clinton, with the final lines of her speech on the teleprompter, at a campaign rally at Grand Valley State University in Allendale, Michigan, U.S. November 7, 2016, the final day of campaigning before the election. REUTERS/Brian Snyder

U.S. Democratic presidential nominee Hillary Clinton greets audience members with the final lines of her speech on the teleprompter at a campaign rally at Grand Valley State University in Allendale, Michigan, U.S. November 7, 2016, the final day of campaigning before the election. REUTERS/Brian Snyder

Handlers for U.S. Democratic presidential nominee Hillary Clinton prepare a teleprompter in Manchester, New Hampshire, U.S., November 6, 2016. REUTERS/Lucas Jackson

An audience member is reflected in a teleprompter as Democratic U.S. presidential nominee Hillary Clinton speaks at a campaign rally at Pitt Community College in Winterville, North Carolina, U.S., November 3, 2016. REUTERS/Brian Snyder - TPX IMAGES OF THE DAY

An audience member is reflected in a teleprompter as Democratic U.S. presidential nominee Hillary Clinton speaks at a campaign rally at Pitt Community College in Winterville, North Carolina, U.S., November 3, 2016. REUTERS/Brian Snyder

Republican presidential nominee Donald Trump holds a campaign event in Eau Claire, Wisconsin U.S. November 1, 2016. REUTERS/Carlo Allegri 

Republican presidential nominee Donald Trump holds a campaign event in Eau Claire, Wisconsin U.S. November 1, 2016. REUTERS/Carlo Allegri 

The audience is reflected in the teleprompter at a campaign rally with U.S. Democratic presidential nominee Hillary Clinton at Pasco-Hernando State College in Dade City, Florida, U.S. November 1, 2016. REUTERS/Brian Snyder

U.S. Democratic presidential nominee Hillary Clinton speaks about the FBI inquiry into her emails during a campaign rally in Daytona Beach, Florida, U.S. October 29, 2016. REUTERS/Brian Snyder TPX IMAGES OF THE DAY

Supporters are seen reflected on a teleprompter mirror as they listen U.S. President Barack Obama speaks at a campaign event in support of U.S. Democratic presidential nominee Hillary Clinton in Cleveland, Ohio, U.S. October 14, 2016. REUTERS/Carlos Barria 

U.S. Democratic presidential candidate Hillary Clinton speaks during a campaign stop in Fort Pierce, Florida, U.S. September 30, 2016. REUTERS/Brian Snyder

Palestinian President Mahmoud Abbas addresses the United Nations General Assembly in the Manhattan borough of New York, U.S., September 22, 2016. REUTERS/Lucas Jackson

Japanese Prime Minister Shinzo Abe speaks during a Reuters Newsmaker conversation in Manhattan, New York, U.S., September 21, 2016. REUTERS/Andrew Kelly 

Canadian Prime Minister Justin Trudeau addresses the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri 

Canadian Prime Minister Justin Trudeau addresses the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri 

Prime Minister Frank Bainimarama of Fiji addresses the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri 

British Prime Minister Theresa May addresses the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri 

British Prime Minister Theresa May addresses the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri 

British Prime Minister Theresa May addresses the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri 

President Tayyip Erdogan of Turkey addresses the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri 

President Tayyip Erdogan of Turkey addresses the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri 

President Tayyip Erdogan of Turkey addresses the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri 

President Tayyip Erdogan of Turkey addresses the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri 

President Tayyip Erdogan of Turkey addresses the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri 

President Tayyip Erdogan of Turkey addresses the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri 

Republican presidential nominee Donald Trump uses a teleprompter for his remarks at a rally with supporters at High Point University in High Point, North Carolina, U.S. September 20, 2016. REUTERS/Jonathan Ernst 

Republican presidential nominee Donald Trump uses a teleprompter for his remarks at a rally with supporters at High Point University in High Point, North Carolina, U.S. September 20, 2016. REUTERS/Jonathan Ernst 

Republican presidential nominee Donald Trump uses a teleprompter for his remarks at a rally with supporters at High Point University in High Point, North Carolina, U.S. September 20, 2016. REUTERS/Jonathan Ernst 

French President Francois Hollande addresses the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri 

French President Francois Hollande adjusts the microphones before addressing the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri 

U.S. President Barack Obama addresses the United Nations General Assembly in New York September 20, 2016. REUTERS/Kevin Lamarque

U.S. President Barack Obama addresses the United Nations General Assembly in New York September 20, 2016. REUTERS/Kevin Lamarque

President David Granger of Guyana addresses the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri 

U.S. President Barack Obama addresses the United Nations General Assembly in the Manhattan borough of New York, U.S., September 20, 2016. REUTERS/Carlo Allegri 

U.S. President Barack Obama addresses the United Nations General Assembly in the Manhattan borough of New York, U.S., September 20, 2016. REUTERS/Carlo Allegri 

U.S. President Barack Obama addresses the United Nations General Assembly in the Manhattan borough of New York, U.S., September 20, 2016. REUTERS/Carlo Allegri 

U.S. President Barack Obama addresses the United Nations General Assembly in the Manhattan borough of New York, U.S., September 20, 2016. REUTERS/Carlo Allegri 

U.S. President Barack Obama addresses the United Nations General Assembly in the Manhattan borough of New York, U.S., September 20, 2016. REUTERS/Carlo Allegri 

U.S. President Barack Obama addresses the United Nations General Assembly in the Manhattan borough of New York, U.S., September 20, 2016. REUTERS/Carlo Allegri 

U.S. President Barack Obama addresses the United Nations General Assembly in the Manhattan borough of New York, U.S., September 20, 2016. REUTERS/Carlo Allegri 

President Michel Temer of Brazil addresses the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri 

President Michel Temer of Brazil addresses the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri 

President Michel Temer of Brazil addresses the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri 

President Michel Temer of Brazil addresses the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Carlo Allegri 

U.S. Democratic presidential candidate Hillary Clinton speaks at a campaign rally in Greensboro, North Carolina, United States September 15, 2016, as she resumed her campaign schedule after a bout with pneumonia.. REUTERS/Brian Snyder

U.S. Democratic presidential candidate Hillary Clinton speaks at a campaign rally in Greensboro, North Carolina, United States September 15, 2016, as she resumed her campaign schedule after a bout with pneumonia.. REUTERS/Brian Snyder

Republican presidential nominee Donald Trump reads off a teleprompter as he speaks at the Cleveland Arts and Social Sciences Academy in Cleveland, Ohio, U.S., September 8, 2016. REUTERS/Mike Segar 

Republican presidential nominee Donald Trump reads from a t teleprompter as he speaks during a campaign rally in Everett, Washington, U.S., August 30, 2016. Picture taken August 30, 2016. REUTERS/Carlo Allegri 

Republican U.S. presidential nominee Donald Trump speaks at Youngstown State University in Youngstown, Ohio August 15, 2016. REUTERS/Eric Thayer 

Republican U.S. presidential nominee Donald Trump speaks at Youngstown State University in Youngstown, Ohio August 15, 2016. REUTERS/Eric Thayer 

Japan's Prime Minister Shinzo Abe is seen through a prompter as he speaks at a news conference at his official residence in Tokyo, Japan, August 3, 2016. REUTERS/Kim Kyung-Hoon 

A teleprompter displaying the speech former Democratic presidential candidate Senator Bernie Sanders (D-VT) is shown at the Democratic National Convention in Philadelphia, Pennsylvania, U.S. July 25, 2016. REUTERS/Gary Cameron 

The teleprompter shows the final lines of a speech by Democratic vice presidential candidate Senator Tim Kaine at a campaign rally with U.S. Democratic presidential candidate Hillary Clinton in Miami, Florida, U.S. July 23, 2016. REUTERS/Brian Snyder 

A teleprompter shows the speech being delivered by Melania Trump, wife of Republican U.S. presidential candidate Donald Trump, as she speaks during the Republican National Convention in Cleveland, Ohio, U.S., July 18, 2016. REUTERS/Carlo Allegri

Republican U.S. presidential candidate Donald Trump walks past a teleprompter as he departs after delivering a foreign policy speech at the Mayflower Hotel in Washington, United States, April 27, 2016. REUTERS/Jim Bourg 

Democratic U.S. presidential candidate Hillary Clinton's speech is shown on a teleprompter as Democratic U.S. presidential candidate Bernie Sanders greets supporters at the Wisconsin Founders Day Gala in Milwaukee, Wisconsin April 2, 2016. REUTERS/Mark Kauzlarich 

Democratic U.S. presidential candidate Hillary Clinton is reflected in a teleprompter as she addresses the American-Israeli Public Affairs Committee (AIPAC) Conference at the Verizon Center in Washington March 21, 2016. REUTERS/Joshua Roberts - TPX IMAGES OF THE DAY