Pro-Kurdish Peoples' Democratic Party (HDP) co-leader Selahattin Demirtas was detained in November on charges of links to Kurdish militants.
The charismatic Demirtas -- who stood against President Recep Tayyip Erdogan in the 2014 elections -- was detained along with another nine HDP lawmakers and his female co-leader Figen Yuksekdag.
Prosecutors in the Kurdish-majority southeastern city of Diyarbakir in the same indictment asked that Yuksekdag serves up to 83 years in jail, the state-run Anadolu news agency added.
But Demirtas, as well as the other MPs, has denied having any links to the PKK and denounced the case as political.
The Kurdish leader -- one of the few politicians to come close to rivalling the rhetorical skills of the Turkish leader -- says he is being punished for daring to oppose Erdogan's drive for a presidential system under a new constitution.
Demirtas last week from behind bars slammed parliamentary debates for a new constitution, saying the arrest of the 11 HDP lawmakers "makes the debate and the vote controversial from the very start".
They are also holding the HDP responsible for the October 2014 street protests led by pro-Kurdish demonstrators against Turkey's policy on Syria. The spiral of violence claimed at least 31 lives.
Demirtas is currently being held at a prison in Edirne, in northwest Turkey, far from the southeastern heartland of the Kurdish movement.
The government had pursued a strategy of peace talks with the PKK but clashes flared in 2015 after the collapse of a two-and-a-half year ceasefire.
According to the HDP, over 50 pro-Kurdish mayors have also been detained, including prominent Mardin mayor Ahmet Turk, who was taken in November.
The detentions came after Turkey defeated a failed July 15 coup aimed at bringing down Erdogan's government and blamed on US-based Muslim preacher Fethullah Gulen.
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