U.S. President Donald Trump talks with Senate Minority Leader Chuck Schumer (D-NY) as he meets with the Senate and House Democratic leadership at the White House in Washington, U.S., December 11, 2018. Reuters/Kevin Lamarque

Men holding placards advocating a no-deal Brexit perform right handed salutes as they demonstrate opposite the Houses of Parliament in London, Britain, December 11, 2018.

Former U.S. Vice President and 2007 Nobel Peace Prize winner Al Gore reacts during his speech at this year's Nobel Peace Prize Forum, in Oslo, Norway December 11, 2018. NTB Scanpix/Heiko Junge via REUTERS

An Iraqi teacher teaches squatter children at the mobile school Bus operates by civil society in Baghdad, Iraq November 22, 2018. Picture taken November 22, 2018.

The sun comes up, silhouetting the statue of Churchill and Big Ben, in Westminster London, Britain, December 11, 2018.

U.S. President Donald Trump sits for an exclusive interview with Reuters journalists in the Oval Office at the White House in Washington, U.S. December 11, 2018.

Rescue teams work at the scene of shooting in Strasbourg, France, December 11, 2018.

British Prime Minister Theresa May is welcomed by Dutch Prime Minister Mark Rutte ahead of a meeting in the Hague, the Netherlands, December 11, 2018.

An Armed Forces of the Democratic Republic of the Congo (FARDC) soldier rests next to a road after Islamist rebel group called the Allied Democratic Forces (ADF) attacked area around Mukoko village, North Kivu province of Democratic Republic of Congo, December 11, 2018.

U.S. first lady Melania Trump is handed a young girl during the Marine Corps Reserve Toys for Tots campaign at Joint Base Anacostia-Bolling in Washington, U.S., December 11, 2018.

Miss Spain Angela Ponce, the first transgender woman to take part in the Miss Universe contest and with Miss Universe 2018 contestants visit the Government House, after their meeting with Thai Prime Minister Prayut Chan-o-cha (not pictured) to promote the event, at the Government House, in Bangkok, Thailand December 11, 2018.

Boys play amidst the bushes on a cold winter day on the outskirts of Srinagar December 11, 2018.

Armed police taser a man inside the grounds of the Houses of Parliament in London, Britain, December 11, 2018.

A migrant from Honduras, part of a caravan of thousands from Central America trying to reach the United States, cries after injuring herself when she jumped a border fence to cross illegally from Mexico to the U.S., as seen from Tijuana, Mexico, December 11, 2018. REUTERS/Mohammed Salem - RC1B6330DCB0

At left, Abdelqader al-Murtada and Saelem Mohammed Noman Al-Mughalles, representatives of the Ansar Allah delegation and at right, Askar Zaeil and Hadi al-Hayi representing the delegation of the Government of Yemen react at the negotiating table together with representatives from the office of the U.N. Special Envoy for Yemen and the International Red Cross Committee (ICRC) when lists of prisoners are exchanged, a first step to implement the agreement to release all prisoners by the two parties, during the ongoing peace talks on Yemen held at Johannesberg Castle, in Rimbo, near Stockholm, Sweden, December 11, 2018. TT News Agency/Claudio Bresciani via REUTERS

A girl stands outside her one-room home in Medina neighbourhood, Dakar, Senegal, December 11, 2018.

Russian cosmonaut Oleg Kononenko conducts a spacewalk outside the International Space Station Space (ISS) in this still image captured from NASA video in space, December 11, 2018. Courtesy NASA TV/Handout via REUTERS

Pro-Brexit and anti-Brexit demonstrators shout at each other opposite the Houses of Parliament, in Westminster, central London, Britain December 11, 2018.