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Supporters of the 'No' march to submit their petition to call for the annulment of a referendum that approved sweeping constitutional changes boosting President Recep Tayyip Erdogan's powers, claiming blatant vote-rigging had swung the result, on April 18, 2017 in Istanbul. (Photo by Erhan Demirtas/NurPhoto via Getty Images)

Supporters of the 'No' march to submit their petition to call for the annulment of a referendum that approved sweeping constitutional changes boosting President Recep Tayyip Erdogan's powers, claiming blatant vote-rigging had swung the result, on April 18, 2017 in Istanbul.  (Photo by Erhan Demirtas/NurPhoto via Getty Images)