Erdogan told state-run TRT channel yesterday that his desire for an expanded presidential role would not undermine democracy and he pointed to the UK as an example.
"In my opinion, even the UK is a semi-presidency. And the dominant element is the Queen," Erdogan said.
The UK is a constitutional monarchy, governed by a parliamentary system, but its hereditary monarch wields only symbolic power.
Erdogan's comments came after fresh criticism from the opposition that he would act like an "Ottoman sultan" once his presidential role has been boosted.
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"I mean, why is it only a monarchy when an idea like this is floated in Turkey?" Erdogan asked.
"We need to speed up to close the gap in this race," he said. "The biggest advantage... Would be in abolishing policy-making through multiple channels."
Erdogan became president in August after more than a decade as prime minister, but the opposition accuses him of transforming the state by imposing a gradual Islamisation and riding roughshod over democracy.
The August elections were the first time a Turkish president, traditionally a ceremonial role, has been directly elected by the people. In the wake of his victory, Erdogan insisted he now has a popular mandate to be an active and powerful leader.
"A new constitution is a must for a new Turkey," Erdogan said.