BANGKOK, June 29 -- Prime Minister Paetongtarn Shinawatra's popularity has plunged to single digits in a new opinion poll, as backlash over a leaked phone call with former Cambodian leader Hun Sen continues to shake Thailand's political scene.

According to Bloomberg, just 9.2 per cent of respondents backed Paetongtarn as their preferred prime minister in a nationwide survey conducted by the National Institute of Development Administration (Nida) from June 19 to 25. That's a dramatic drop from the 30.9 per cent support she garnered in March.

The youngest daughter of former premier Thaksin Shinawatra, Paetongtarn has been under intense pressure since a June 15 recording of her conversation with Hun Sen surfaced, with critics interpreting ...