Mauricio Macri, president of Argentina, speaks during a luncheon with oil executives in Houston, Texas, U.S., on Wednesday, April 26, 2017. Macri met with oil and natural gas executives in Houston on Wednesday as he seeks a flow of investment into Vaca Muerta, one of the largest shale plays outside of North America that remains largely untapped. Photographer: Aaron M. Sprecher/Bloomberg via Getty Images
