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Beatriz Gutierrez Muller wife of Andres Manuel Lopez Obrador, presidential candidate of the National Regeneration Movement Party (MORENA), gestures during a campaign rally in Ciudad Juarez, Chihuahua state, Mexico, on Sunday, April 1, 2018. Obrador has said if he wins the election in July, he will ask President Enrique Pena Nieto to stop awarding all new private oil contracts. Photographer: Mauricio Palos/Bloomberg via Getty Images

Beatriz Gutierrez Muller wife of Andres Manuel Lopez Obrador, presidential candidate of the National Regeneration Movement Party (MORENA), gestures during a campaign rally in Ciudad Juarez, Chihuahua state, Mexico, on Sunday, April 1, 2018. Obrador has said if he wins the election in July, he will ask President Enrique Pena Nieto to stop awarding all new private oil contracts. Photographer: Mauricio Palos/Bloomberg via Getty Images