Varadkar’s departure as head of a three-party coalition does not automatically trigger a general election and he could be replaced by a new Fine Gael leader, with a leadership contest targeted for early April. It comes after the government was resoundingly beaten in two referendums on proposed changes to the Irish constitution.

https://www.dailymail.co.uk/news/article-13218581/Leo-Varadkar-RESIGN-Irish-PM-leader-Fine-Gael-party.html