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U.S. President Barack Obama waves during a town hall event at Usina de las Artes in Buenos Aires, Argentina, on Wednesday, March 23, 2016. Obama became the first U.S. president to visit Argentina in more than a decade as his counterpart, Mauricio Macri, seeks a rapprochement with the international community following a decade of financial and diplomatic isolation. Photographer: Diego Levy/Bloomberg via Getty Images

U.S. President Barack Obama waves during a town hall event at Usina de las Artes in Buenos Aires, Argentina, on Wednesday, March 23, 2016. Obama became the first U.S. president to visit Argentina in more than a decade as his counterpart, Mauricio Macri, seeks a rapprochement with the international community following a decade of financial and diplomatic isolation. Photographer: Diego Levy/Bloomberg via Getty Images