A central government liaison official has crossed fire with Liberal Party head James Tien Pei-chun at a meeting in Beijing.
Shen Chong, director of the liaison office's co-ordination department, said some in Hong Kong raised their opinions with "ulterior motives".
He was speaking at a discussion with Hong Kong delegates to the Chinese People's Consultative Conference, and the remarks were made in reply to Tien, who said he hesitated to use his capacity as a member of the nation's advisory body when criticising the city's government.
"[CPPCC] members' opinions about the Hong Kong government should premise on their belief in the Communist Party's leadership and the socialist system," Shen said. "It is okay to raise opinions if one supports the government under 'one country, two systems'. But some raise opinions with ulterior motives."
He did not elaborate on whether his comments were aimed at Tien or his Liberal Party, whose relationship with Chief Executive Leung Chun-ying's government has deteriorated.
The pro-business party has been increasingly vocal. It supported an unsuccessful attempt to launch an investigation of the government's rejection of Hong Kong Television Network's licence application, and voted against extra stamp duty.
Tien had been bemoaning the government's reluctance to listen to his party's opinions.