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Greek PM and SYRIZA leader Alexis Tsipras delivers a speech at the opening of the second congress of SYRIZA, in Athens on October 13, 2016 (Photo by Panayiotis Tzamaros/NurPhoto via Getty Images)

Greek PM and SYRIZA leader Alexis Tsipras delivers a speech at the opening of the second congress of SYRIZA, in Athens on October 13, 2016  (Photo by Panayiotis Tzamaros/NurPhoto via Getty Images)

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Prime Minister Alexis Tsipras, leader of SYRIZA attends opening of the second congress of SYRIZA with a speech of Prime Minister Alexis Tsipras, in Faliro near Athens on October 13, 2016. (Photo by Wassilios Aswestopoulos/NurPhoto via Getty Images)

Prime Minister Alexis Tsipras, leader of SYRIZA attends opening of the second congress of SYRIZA with a speech of Prime Minister Alexis Tsipras, in Faliro near Athens on October 13, 2016. (Photo by Wassilios Aswestopoulos/NurPhoto via Getty Images)

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Prime Minister and chairman of SYRIZA Alexis Tsipras during meeting of the Central Committee SYRIZA, Saturday 25 / Sunday 26 at Divani Caravel Hotel in Athens on June 25, 2016. One of the central topics was the impact of the Brexit. (Photo by Wassilios Aswestopoulos/NurPhoto via Getty Images)

Prime Minister and chairman of SYRIZA Alexis Tsipras during meeting of the  Central Committee SYRIZA, Saturday 25 / Sunday 26 at  Divani Caravel Hotel in Athens on June 25, 2016. One of the central topics was the impact of the Brexit.
(Photo by Wassilios Aswestopoulos/NurPhoto via Getty Images)

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Greek PM and SYRIZA leader Alexis Tsipras delivers a speech at the opening of the second congress of SYRIZA, in Athens on October 13, 2016 (Photo by Panayiotis Tzamaros/NurPhoto via Getty Images)

Greek PM and SYRIZA leader Alexis Tsipras delivers a speech at the opening of the second congress of SYRIZA, in Athens on October 13, 2016  (Photo by Panayiotis Tzamaros/NurPhoto via Getty Images)