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.

Philippine voters delivered a blow to President Ferdinand Marcos Jr. and a boost to the controversial Duterte clan, whose performance in midterm elections Monday shows they may have a chance to regain the nation’s highest office in 2028.

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