On 21 February 2017, the Turkish parliament had unlawfully revoked HDP (Peoples' Democratic Party) Co-chair Figen Yüksekdağ’s parliamentary membership. On 9 March, the Supreme Court of Appeals made a decision to strip off Yüksekdağ’s membership to the HDP. Any information regarding her duty records was also removed from the registry of the Supreme Court of Appeal. According to this decision, Yüksekdağ can no longer serve as the co-chair of HDP.

Deputy Co-chair of HDP Responsible for Foreign Affairs, Hişyar Özsoy released a statement regarding the unlawful revoking of co-chair Figen Yüksekdağ’s party membership.

Describing the decision as unacceptable on both political and legal grounds, Özsoy pointed out that: "The right to vote and to be elected and, more broadly, the right to engage in political activities are among the most basic political rights, which are regulated in the Article 67 of the Constitution. The framework of these rights is legally regulated, particularly with the Law on Political Parties. There is no procedure in this law regarding the stripping off party membership. Moreover, with respect to internal regulations of the Supreme Court, the deputy chief prosecutor of the Supreme Court does not have any authority to strip off party memberships. This is an arbitrary and political decision to weaken our party before the upcoming referendum.

Ms. Yüksekdağ is still our Co-chair and we will not accept this unlawful decision of Supreme Court of Appeal. We will make appeals to the national and international courts. We will continue to expose the deeply politicized character of legal institutions in Turkey, which the AKP/Erdoğan government has been using to eliminate its opponents and to re-design the political system."

HDP's Özsoy called on all relevant international democratic institutions, supranational entities of which Turkey is a member, and any organization concerned with the rule of law and democratic future of Turkey to examine how Yüksekdağ’s party membership and parliamentary seat were revoked, and to take a position and action to stop this repression campaign on the HDP as the country gets closer to the referendum date.