HAMBURG, GERMANY – JULY 07: German Chancellor Angela Merkel talks to Mauricio Macri of Argentina (L) and US President Donald Trump during the G20 leaders retreat as part of the G20 summit on July 7, 2017 in Hamburg, Germany. Leaders of the G20 group of nations are meeting for the July 7-8 summit. Topics high on the agenda for the summit include climate policy and development programs for African economies. (Photo by Friedemann Vogel – Pool/Getty Images)