Sipila is due to step down at an extraordinary party congress on Sept. 7. He has chaired the Center Party, a major political establishment, since 2012, and been the Nordic country's prime minister since 2015. Sipila continued heading a caretaker government after his three-party coalition resigned in March,
The center-left Social Democratic Party emerged as Finland's largest party with a tight win over the populist Finns Party in the election. Only 0.2 percentage points separate them.