An US embassy employee, Metin Topuz, was allegedly accused of having links to Fethullah Gülen movement. Topuz, a Turkish citizen who works for US embassy was arrested last week because he knew key information on the alleged involvement of US in the coup.
Erdoğan has requested Fethullah Gülen from the United States for several times but this request was not accomplished. Erdoğan even bargained releasing Pastor Andrew Brunson who had been arrested for involvement in the failed coup. 78 signatures have been gathered for the release of Pastor in the Congress.
After the US suspended visa service for Turkish citizens, Turkey also put the services on ice. This restriction blocks US citizens entering Turkey and Turks in North America. It doesn’t apply if you already have a visa.