The government has arrested at least 160,000 people, dismissed 152,000 civil servants and purged the judiciary since the coup attempt.
Erdogan long ago became the Turkish equivalent of corrupt Russian leader Vladimir Putin.
The country looks set to return to single-party rule.
The Turkish president has yet to make a public appearance since the AK Party lost its majority in a parliamentary vote.
Turkish and Swedish observers say they were barred from polling stations.
The election dealt a blow to President Tayyip Erdogan's ambitions.
The country will either remain a parliamentary system or become more authoritarian.
Ahmet Davutoğlu promises to resign if accusations of 3,500-strong election fraud team are true