G20 leaders pose for a family photo during the G20 summit in Buenos Aires, Argentina November 30, 2018. REUTERS

Security forces on armoured vehicles patrol near Costa Salguero, the venue of the G20 Leaders' Summit, during a security operation in Buenos Aires, on November 30, 2018 AFP

Turkish first lady Emine Erdogan, Canada's Prime Minister Justin Trudeau's spouse Sophie Gregoire Trudeau, Chinese President Xi Jinping' spouse Peng Liyuan, Argentina's first lady Juliana Awada, U.S. first lady Melania Trump REUTERS

Brazil's President Michel Temer (L), South Africa's President Cyril Ramaphosa (2-L) Russia's President Vladimir Putin (C), India's Prime Minister Narendra Modi (2-R) and China's President Xi Jinping, hold a BRICS Leaders' meeting in the sidelines of the G20 Leaders' Summit in Buenos Aires, on November 30, 2018 AFP

U.S. President Donald Trump, Mexico's President Enrique Pena Nieto and Canada's Prime Minister Justin Trudeau attend the USMCA signing ceremony before the G20 leaders summit in Buenos Aires, Argentina November 30, 2018. REUTERS

Leaders sit for the start of the G20 summit in Buenos Aires, Argentina, Friday, Nov. 30, 2018. From left, sitting, are President Donald Trump, Britain's Prime Minister Theresa May, Turkey's President Recep Tayyip Erdogan, South Africa's President Cyril Ramaphosa and Saudi Arabia's Crown Prince Mohammed bin Salman AP

General view of the G20 Leaders' Summit in Buenos Aires, on November 30, 2018 AFP

Security forces on armoured vehicles patrol near Costa Salguero, the venue of the G20 Leaders' Summit, during a security operation in Buenos Aires, on November 30, 2018 AFP

Actors stage a performance under a banner that reads in Spanish "Property of the G20? Who chose?" to protest the G20 Summit outside the presidential palace in Buenos Aires, Argentina, Thursday, Nov. 29, 2018 AP

A figure made of recycled materials, resembling U.S. President Donald Trump, is seen during a protest ahead of the G20 leaders summit, in Buenos Aires, Argentina November 29, 2018. REUTERS

Members of social groups gather to protest against the Group 20 summit, in Buenos Aires, Argentina November 28, 2018. REUTERS

Britain's Prime Minister Theresa May, left, enters to shake hands with Argentina's President Mauricio Macri at the start of the G20 summit in Buenos Aires, Argentina, Friday, Nov. 30, 2018 AFP

French President Emmanuel Macron (L), the president of the European Commission Jean Claude Juncker (2-L), Spanish Prime Minister Pedro Sanchez (3-L, top), Italian Prime Minister Giuseppe Conte (2-R), and British Prime Minister Theresa May (bottom) meet for a working session prior to the G20 Summit on November 29, 2018 AFP

(L-R) The president of the European Council Donald Tusk, French President Emmanuel Macron, the president of the European Commission Jean Claude Juncker, Spanish Prime Minister Pedro Sanchez, Italian Prime Minister Giuseppe Conte, British Prime Minister Theresa May and the Netherland's Prime Minister Mark Rutte meet for a working session prior to the G20 Summit on November 29, 2018 AFP

A man holds a sign depicting US President Donald Trump reading "Global warming? I don't believe so" during a protest as the G20 Leaders' Simmut takes place in Buenos Aires on November 30, 2018 AFP

A woman changes a toddler's diaper next to headscarves displayed for sale against the G20 Leaders' Summit as it takes place in Buenos Aires on November 30, 2018 AFP

Members of the Workers' party protest with a sign reading "Out G20 of Argentina" as the G20 Leaders' Summit takes place in Buenos Aires on November 30, 2018 AFP

A vendor sells headscarves against the G20 Leaders' Summit as it takes place in Buenos Aires on November 30, 2018 AFP

Soldiers stand by at the start of the G20 summit in Buenos Aires, Argentina, Friday, Nov. 30, 2018 AP