After the 2017 Turkish constitutional referendum, which significantly expanded President Erdoğan's powers, Kılıçdaroğlu and CHP filed a court appeal against a decision by Turkey's Supreme Electoral Council (YSK) to accept unstampted ballots. Kemal Kılıçdaroğlu has said that the YSK decision may be appealed to the ECHR, but members of the AKP government have said that neither ECHR nor Turkey's Constitutional Court have any jurisdiction over the YSK decision. Kılıçdaroğlu said: "In 2014 [the Constitutional Court] said ‘Elections are canceled if there is no seal on ballot papers or envelopes.’[ ... ]The YSK can't express an opinion above the will of the parliament,[ ... ]If the Constitutional Court rejects our application, we will regard the changes as illegitimate. There is also the ECHR. If necessary, we will take the case there.”