“Receiving the most important leaders in the world altogether at the same time in the same place is something that has never happened in our country,” Argentina’s President Mauricio Macri said on the eve of the G-20 summit which Buenos Aires hosted on 30 November and 1 December. Macri said the summit ended “decades of isolation” for Argentina. He secured the signing of a final declaration, despite some irreconcilable differences between some attendees over global trade and climate change, and sealed a series of major bilateral trade, investment, and cooperation accords, notably with China. But as the world leaders packed up and left, Macri was soon reminded of his domestic political difficulties, after his maverick ally Elisa Carrió exposed some serious differences with his government.