President Recep Tayyip Erdogan argues that strengthening the presidency will avert instability associated with coalition governments, at a time when Turkey also faces security threats from armed groups, including the Islamic State of Iraq and the Levant (ISIL, also known as ISIS) and the Kurdish PKK.
In Turkey, police have arrested over one thousand people suspected of being part of a movement for the failed coup previous year.
Police officers escort detainees in Kayseri, Turkey, on Wednesday.
It was not immediately clear if the suspensions were directly connected to the detention of the suspects whom Interior Minister Suleyman Soylu described as "secret imams" who had allegedly infiltrated the police force. The suspects are allegedly Gulen operatives who directed followers within the police force.
Since the coup, in which 249 people died, the government has accused the Gulenist movement of infiltrating the the country's institutions including the police, military and judiciary and of running a state within a state.
An 8,500-officer Ankara-based operation targeted FETO police infiltration in 81 provinces.
At least 1,013 have been detained so far in one of the largest operations against the Gulen movement in recent months, according to Anadolu. After the latest sweep, German foreign ministry spokesman Sebastian Fischer said Berlin "has taken note of the mass detentions with concern", urging respect for rule of law. Ankara has accused Gulen of masterminding the government takeover, whereas the cleric himself, who now lives in exile in the United States, has denounced the allegations.
The authorities have also since then sacked or suspended 120,000 others from a wide range of professions including soldiers, police, teachers and public servants, over alleged links with terrorist groups.
Police have arrested 1,000 people suspected of being part of a movement blamed for the failed 2016 coup, the BBC reports. Erdogan has repeatedly said he will wipe out the "virus" of Gulen from state institutions after the failed coup.