Erdoğan has been criticised for his politicisation of the media, especially after the 2013 protests. The opposition Republican People's Party (CHP) alleged that over 1,863 journalists lost their jobs due to their anti-government views in 12 years of AKP rule. Opposition politicians have also alleged that intimidation in the media is due to the government's attempt to restructure the ownership of private media corporations. Journalists from the Cihan News Agency and the Gülenist Zaman newspaper were repeatedly barred from attending government press conferences or asking questions. Several opposition journalists such as Soner Yalçın were controversially arrested as part of the Ergenekon trials and Sledgehammer coup investigation. Veli Ağbaba, a CHP politician, has called the AKP the 'biggest media boss in Turkey.'