Parliament revised the text of the prospective referendum concerning presidential election to assure that the president is not affected.
The referendum will be conducted on Sunday on who should elect the president, the people or Parliament.
Some legal analysts and opposition parties had argued that the wording could have put Gul's term in question and triggered a political crisis. The wording was set before Gul was elected.
The referendum also proposes limiting the term in office to five years, although the president would be allowed to run for a second term.
Prime Minister Recep Tayyip Erdogan has called on people to vote in favor of the changes.
The discovery of the submarine has unveiled a few "inconsistencies." For example, how can one explain the fact that the sub was found where it needed to be searched for from the start?
The TurkStream, which runs along the bottom of the Black Sea from Russia's Anapa to Turkey, will consist of two lines, each with a capacity of 15.75 billion cubic meters of gas a year