ISTANBUL, TURKEY - APRIL 17: People chant slogans and march in the street protesting the result of last nights constitutional referendum on April 17, 2017 in Istanbul, Turkey. Opposition groups have vowed to challenge the "Evet" (Yes) outcome to grant expansive new powers to President Recep Tayyip Erdogan.International election monitors delivered a report today saying the vote took place on an "unlevel playing field". (Photo by Chris McGrath/Getty Images)
ISTANBUL, TURKEY - MARCH 08: A woman marches with a sign in support of the "No" campaign for the upcoming constitutional referendum while attending a march down famous Istiklal street during a rally for International Women's Day on March 8, 2017 in Istanbul, Turkey. Women around the globe attended events, rallies and protests to highlight the work and achievements of women all over the world. International Women's Day was first marked in 1911. (Photo by Chris McGrath/Getty Images)
ISTANBUL, TURKEY - APRIL 17: People chant slogans and march in the street protesting the result of last nights constitutional referendum on April 17, 2017 in Istanbul, Turkey. Opposition groups have vowed to challenge the "Evet" (Yes) outcome to grant expansive new powers to President Recep Tayyip Erdogan.International election monitors delivered a report today saying the vote took place on an "unlevel playing field". (Photo by Chris McGrath/Getty Images)
ISTANBUL, TURKEY - APRIL 17: People chant slogans and march in the street protesting the result of last nights constitutional referendum on April 17, 2017 in Istanbul, Turkey. Opposition groups have vowed to challenge the "Evet" (Yes) outcome to grant expansive new powers to President Recep Tayyip Erdogan.International election monitors delivered a report today saying the vote took place on an "unlevel playing field". (Photo by Chris McGrath/Getty Images)
ISTANBUL, TURKEY - APRIL 17: People chant slogans and march in the street protesting the result of last nights constitutional referendum on April 17, 2017 in Istanbul, Turkey. Opposition groups have vowed to challenge the "Evet" (Yes) outcome to grant expansive new powers to President Recep Tayyip Erdogan.International election monitors delivered a report today saying the vote took place on an "unlevel playing field". (Photo by Chris McGrath/Getty Images)
