On April 16, millions of people are expected to vote in a referendum on Turkey's constitution and whether the country should become a presidential republic.
The proposed changes to the constitution require a simple majority, or 51 percent, in the referendum.
But the vote has divided opinions in Istanbul.
TRT World's Ali Mustafa begins his two-week journey across Turkey to find out what people are saying about the referendum.
Polls currently suggest a close contest in Turkey's upcoming referendum. With Some wanting a change & others happy with the current system. pic.twitter.com/RzdemD4Am7
— TRT World (@trtworld) March 23, 2017