Why did SYRIZA, the main opposition party in Greece, split?

Stefanos Kasselakis, the new leader of the main opposition Radical Left Coalition (SYRIZA) in Greece, invited party members who accused him of being "right-wing" to resign. In response, 53 members of SYRIZA resigned, eight of them former ministers and two MPs. The left-wing "Umbrella" faction, led by former Finance Minister Euclid Chakalotos, also accused Kasselakis of "Trumpist practices and right-wing populist policies".

SYRIZA's Central Committee meeting over the weekend was eventful.