TOPSHOT - People wave "YES" banners and Turkish national flags on April 8, 2017 during a campaign rally for the "yes" vote in a constitutional referendum in Istanbul.
On April 16, 2017, the Turkish public will vote on whether to change the current parliamentary system into an executive presidency.  / AFP PHOTO / BULENT KILIC        (Photo credit should read BULENT KILIC/AFP/Getty Images)