Philippine President Rodrigo Duterte on Monday ended months of speculation about his political plans by filing his candidacy for a senate seat in next year’s elections.However, he kept up the political intrigue by saying he would not support the presidential bid of former senator Ferdinand “Bongbong” Marcos Jnr, the son of the former dictator, who has asked Duterte’s daughter Sara to be his running mate.That came despite a survey by the private pollster Social Weather Stations that found Marcos…