MANILA - A senator and close ally of President Rodrigo Duterte has denounced the Singaporean chief executive of a motorcycle ride-sharing firm and wants her declared "persona non grata" - or unwelcomed - in the Philippines.

Senator Aquilino Pimentel III accused Angkas head Angeline Tham, 37, of being "high-handed, arrogant and irresponsible" in a resolution filed in the Senate on Jan 16 .