Allies of Philippine President Ferdinand Marcos Jr looked set to win at least half of the available Senate seats in a midterm election on Monday, an unofficial tally showed, in a contest seen as a referendum on his leadership and a fierce proxy battle with his estranged vice president.

Even though he is detained in The Hague, former Philippine President Rodrigo Duterte is among the candidates vying for some 18,000 national and local seats in Monday's midterm elections that analysts say will decide if he and his family continue to hold political power.

Rodrigo Duterte, the Philippines detained former president, seems set to reclaim the mayoral seat in Davao City, Rappler News reported Monday, citing unofficial election results.