https://en.wikipedia.org/wiki/President_of_Turkey#Eligibility
Arrest of Opposition's (Presumptive) Candidate: https://en.wikipedia.org/wiki/Arrest_of_Ekrem_%C4%B0mamo%C4%9Flu
On 19 March 2025, Istanbul Mayor Ekrem İmamoğlu from the opposition Republican People's Party was arrested by Turkish police for alleged corruption, extortion, bribery, money laundering and supporting terrorism, particularly the PKK. His arrest, along with that of more than 100 other people, caused widespread protests and demonstrations.
Since November 2024, AKP actions against opposition representatives heated up. On 18 March 2025, Istanbul University annulled İmamoğlu's degree, citing irregularities. As Turkey's presidential candidates must hold an university degree, this would effectively block him from running for president. The decision came just days before the opposition party was set to nominate him.