Philippine President Ferdinand Marcos Jr has been dealt an unexpected blow in the midterms, with his Senate candidates set to pick up fewer seats than expected, according to early results. The election was a showdown between Marcos and his Vice-President Sara Duterte, daughter of former president Rodrigo Duterte.

Here’s what to know about the crucial midterms and the rival dynasties at the heart of the Southeast Asian nation’s politics.

Philippine voters appear to have delivered a blow to President Ferdinand Marcos Jr. and a boost to the rival Duterte clan, whose members and allies outperformed expectations in Monday’s midterm elections.