ATHENS, GREECE - JULY 05 : Greece's Finance Minister Yanis Varoufakis casts his ballot in bailout referendum at a polling station in Athens, Greece, July 05, 2015. (Ayhan Mehmet - Anadolu Agency)

ATHENS, GREECE - JULY 05 : Greece's Finance Minister Yanis Varoufakis casts his ballot in bailout referendum at a polling station in Athens, Greece, July 05, 2015. (Salih Baran - Anadolu Agency)

ATHENS, GREECE - JULY 05: A woman casts her ballot in bailout referendum at a polling station in Athens, Greece, July 05, 2015. Greeks are asked to approve or disapprove of a plan from the European Commission, the European Central Bank and the International Monetary Fund to help resolve the country’s fiscal crisis. (Ayhan Mehmet - Anadolu Agency)

ATHENS, GREECE - JULY 05: A woman casts her ballot in bailout referendum at a polling station in Athens, Greece, July 05, 2015. Greeks are asked to approve or disapprove of a plan from the European Commission, the European Central Bank and the International Monetary Fund to help resolve the country’s fiscal crisis. (Ayhan Mehmet - Anadolu Agency)

ATHENS, GREECE - JULY 05: A man casts his ballot in bailout referendum at a polling station in Athens, Greece, July 05, 2015. Greeks are asked to approve or disapprove of a plan from the European Commission, the European Central Bank and the International Monetary Fund to help resolve the country’s fiscal crisis. (Ayhan Mehmet - Anadolu Agency)

ATHENS, GREECE - JULY 05: A woman casts her ballot in bailout referendum at a polling station in Athens, Greece, July 05, 2015. Greeks are asked to approve or disapprove of a plan from the European Commission, the European Central Bank and the International Monetary Fund to help resolve the country’s fiscal crisis. (Ayhan Mehmet - Anadolu Agency)

Greek Prime Minister Alexis Tsipras casts his ballot in bailout referendum at a polling station in Athens, Greece, July 05, 2015. Greeks are asked to approve or disapprove of a plan from the European Commission, the European Central Bank and the International Monetary Fund - known as the troika - to help resolve the country’s fiscal crisis. (Ayhan Mehmet - Anadolu Ajansı)

Greek Prime Minister Alexis Tsipras casts his ballot in bailout referendum at a polling station in Athens, Greece, July 05, 2015. Greeks are asked to approve or disapprove of a plan from the European Commission, the European Central Bank and the International Monetary Fund - known as the troika - to help resolve the country’s fiscal crisis. (Ayhan Mehmet - Anadolu Ajansı)

Greek Prime Minister Alexis Tsipras casts his ballot in bailout referendum at a polling station in Athens, Greece, July 05, 2015. Greeks are asked to approve or disapprove of a plan from the European Commission, the European Central Bank and the International Monetary Fund - known as the troika - to help resolve the country’s fiscal crisis. (Ayhan Mehmet - Anadolu Ajansı)

ATHENS, GREECE - JULY 05: A man casts his ballot in bailout referendum at a polling station in Athens, Greece, July 05, 2015. Greeks are asked to approve or disapprove of a plan from the European Commission, the European Central Bank and the International Monetary Fund to help resolve the country’s fiscal crisis. (Salih Baran - Anadolu Agency)

ATHENS, GREECE - JULY 05: A woman casts her ballot in bailout referendum at a polling station in Athens, Greece, July 05, 2015. Greeks are asked to approve or disapprove of a plan from the European Commission, the European Central Bank and the International Monetary Fund to help resolve the country’s fiscal crisis. (Salih Baran - Anadolu Agency)

Athens's citizents cast their ballot in bailout referendum at a polling station in Athens, Greece, July 05, 2015. Greeks are asked to approve or disapprove of a plan from the European Commission, the European Central Bank and the International Monetary Fund - known as the troika - to help resolve the country’s fiscal crisis. (Ayhan Mehmet - Anadolu Agency)

A man casts his ballot in bailout referendum at a polling station in Athens, Greece, July 05, 2015. Greeks are asked to approve or disapprove of a plan from the European Commission, the European Central Bank and the International Monetary Fund - known as the troika - to help resolve the country’s fiscal crisis. (Ayhan Mehmet - Anadolu Ajansı)