The ally of Turkish President Recep Tayyip Erdogan who has been nominated as the country's new prime minister has called for a move to presidential rule.
Addressing a congress of the ruling AK Party before it confirmed him as party leader, Binali Yildirim called for a new constitution.
He said it was time to make the current "de facto situation" a "legal" one.
Mr Erdogan came to office in 2014 when Turkey held its first presidential election by direct national vote.
Previously, presidents had been elected by parliament.
As leader of the party, Mr Yildirim has been asked to form Turkey's next government.
The promotion of Mr Yildirim, who was previously transport minister, comes after Ahmet Davutoglu quit as prime minister over a rift with Mr Erdogan.
Among challenges Turkey faces are security threats from PKK Kurdish militants and the Islamic State (IS) group, and its ambition to join the EU while tackling the migrant crisis.
