Philippine President Rodrigo Duterte said on Tuesday he will run for the vice presidency in next year's elections, confirming an earlier announcement by the country's ruling political party that was criticised by opponents as a ploy for Duterte to maintain his grip on power.

The announcement came ahead of the party's national convention on Sept 8, where it is also expected to endorse Duterte's aide and incumbent senator Christopher "Bong" Go to be its presidential candidate in the...