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ISTANBUL, TURKEY - APRIL 16: People celebrate the 'Evet' (Yes) vote result outside AK Party headquarters on April 16, 2017 in Istanbul, Turkey. According to unofficial results 51.21% were in favour and 48.79% against. Constitutional referendum voting took place across Turkey after months of intense campaigning by both the 'Evet'(Yes) and 'Hayir' (No) camps. Turks voted 'Evet' (Yes) on 18 proposed amendments to the Constitution of Turkey. The controversial changes will replace the parliamentary system moving to a presidential system, giving President Recep Tayyip Erdogan executive authority. (Photo by Chris McGrath/Getty Images)

ISTANBUL, TURKEY - APRIL 16: People celebrate the 'Evet' (Yes) vote result outside AK Party headquarters on April 16, 2017 in Istanbul, Turkey. According to unofficial results 51.21% were in favour and 48.79% against. Constitutional referendum voting took place across Turkey after months of intense campaigning by both the 'Evet'(Yes) and 'Hayir' (No) camps. Turks voted 'Evet' (Yes) on 18 proposed amendments to the Constitution of Turkey. The controversial changes will replace the parliamentary system moving to a presidential system, giving President Recep Tayyip Erdogan executive authority. (Photo by Chris McGrath/Getty Images)
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ISTANBUL, TURKEY - APRIL 16: People celebrate the "Evet" (Yes) vote result outside AK Party headquarters on April 16, 2017 in Istanbul, Turkey. According to unofficial results 51.21% were in favour and 48.79% against. Constitutional referendum voting took place across Turkey after months of intense campaigning by both the "Evet"(Yes) and "Hayir" (No) camps. Turks voted "Evet" (Yes) on 18 proposed amendments to the Constitution of Turkey. The controversial changes will replace the parliamentary system moving to a presidential system, giving President Recep Tayyip Erdogan executive authority. (Photo by Chris McGrath/Getty Images)

ISTANBUL, TURKEY - APRIL 16: People celebrate the "Evet" (Yes) vote result outside AK Party headquarters on April 16, 2017 in Istanbul, Turkey. According to unofficial results 51.21% were in favour and 48.79% against. Constitutional referendum voting took place across Turkey after months of intense campaigning by both the "Evet"(Yes) and "Hayir" (No) camps. Turks voted "Evet" (Yes) on 18 proposed amendments to the Constitution of Turkey. The controversial changes will replace the parliamentary system moving to a presidential system, giving President Recep Tayyip Erdogan executive authority. (Photo by Chris McGrath/Getty Images)
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ISTANBUL, TURKEY - APRIL 16 : "Yes" supporters celebrate their victory in front of Justice and Development AK Party's provincial headquarters after early results as vote counting continues following the constitutional referendum on April 16, 2017 in Istanbul, Turkey. Turkish people voted on the proposed change to a presidential system to replace the parliamentary democracy, with 18 articles proposed to be amended in the constitution. (Photo by Arif Hudaverdi Yaman/Anadolu Agency/Getty Images)

ISTANBUL, TURKEY - APRIL 16 : "Yes" supporters celebrate their victory in front of Justice and Development AK Party's provincial headquarters after early results as vote counting continues following the constitutional referendum on April 16, 2017 in Istanbul, Turkey. Turkish people voted on the proposed change to a presidential system to replace the parliamentary democracy, with 18 articles proposed to be amended in the constitution. (Photo by Arif Hudaverdi Yaman/Anadolu Agency/Getty Images)
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ISTANBUL, TURKEY - APRIL 16: People celebrate the "Evet" (Yes) vote result outside AK Party headquarters on April 16, 2017 in Istanbul, Turkey. According to unofficial results 51.21% were in favour and 48.79% against. Constitutional referendum voting took place across Turkey after months of intense campaigning by both the "Evet"(Yes) and "Hayir" (No) camps. Turks voted "Evet" (Yes) on 18 proposed amendments to the Constitution of Turkey. The controversial changes will replace the parliamentary system moving to a presidential system, giving President Recep Tayyip Erdogan executive authority. (Photo by Chris McGrath/Getty Images)

ISTANBUL, TURKEY - APRIL 16: People celebrate the "Evet" (Yes) vote result outside AK Party headquarters on April 16, 2017 in Istanbul, Turkey. According to unofficial results 51.21% were in favour and 48.79% against. Constitutional referendum voting took place across Turkey after months of intense campaigning by both the "Evet"(Yes) and "Hayir" (No) camps. Turks voted "Evet" (Yes) on 18 proposed amendments to the Constitution of Turkey. The controversial changes will replace the parliamentary system moving to a presidential system, giving President Recep Tayyip Erdogan executive authority. (Photo by Chris McGrath/Getty Images)
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Getty Images News Chris McGrath

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ISTANBUL, TURKEY - APRIL 16: People celebrate the 'Evet' (Yes) vote result outside AK Party headquarters on April 16, 2017 in Istanbul, Turkey. According to unofficial results 51.21% were in favour and 48.79% against. Constitutional referendum voting took place across Turkey after months of intense campaigning by both the 'Evet'(Yes) and 'Hayir' (No) camps. Turks voted 'Evet' (Yes) on 18 proposed amendments to the Constitution of Turkey. The controversial changes will replace the parliamentary system moving to a presidential system, giving President Recep Tayyip Erdogan executive authority. (Photo by Chris McGrath/Getty Images)

ISTANBUL, TURKEY - APRIL 16: People celebrate the 'Evet' (Yes) vote result outside AK Party headquarters on April 16, 2017 in Istanbul, Turkey. According to unofficial results 51.21% were in favour and 48.79% against. Constitutional referendum voting took place across Turkey after months of intense campaigning by both the 'Evet'(Yes) and 'Hayir' (No) camps. Turks voted 'Evet' (Yes) on 18 proposed amendments to the Constitution of Turkey. The controversial changes will replace the parliamentary system moving to a presidential system, giving President Recep Tayyip Erdogan executive authority. (Photo by Chris McGrath/Getty Images)
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Getty Images News Chris McGrath