US President Donald Trump (L) is welcomed by Argentina’s President Mauricio Macri at Casa Rosada presidential house in Buenos Aires, on November 30, 2018, to hold a meeting in the sidelines of the G20 Leaders’ Summit. – G20 powers open two days of summit talks on Friday after a stormy buildup dominated by tensions with Russia and US President Donald Trump’s combative stance on trade and climate fears. (Photo by SAUL LOEB / AFP)