PKR deputy president asks Seri Setia voters to reject such politics and vote for reforms.
Dr Halimah Ali is a member of the party's central committee and a former Selangor executive councillor.
Halimah, who was a former Speaker of Parliament, is now the first female president of Singapore, succeeding Tony Tan Keng Yam.
The election in September is reserved for Malay candidates.
Front-runner Halimah Yacob, of Indian-Malay heritage, says she has been certified as a member of the Malay community four times in the past general elections.