Turkish President Recep Tayyip Erdoğan has sued main opposition Republican People’s Party (CHP) leader Kemal Kılıçdaroğlu for “insulting the presidential office” in remarks on an alleged phone conversation between Erdoğan and his son.

Erdoğan’s lawyer, Hüseyin Aydın, filed a letter complaint against Kılıçdaroğlu on Jan. 8 stating that the CHP leader had voiced arguments “used by the Fetullahist Terrorist Organization (FETÖ)” by referring to alleged recordings of the phone conversations.

The complaint came after the CHP leader on Jan. 5 blasted Erdoğan and the ruling Justice and Development Party (AKP) over the Interior Ministry’s order to dismiss the CHP’s Istanbul Beşiktaş district mayor Murat Hazinedar.