Metro Manila (CNN Philippines, June 23) — After a second former Philippine government official was barred from entering Hong Kong, a lawmaker of the semi-autonomous city will raise the issue before Hong Kong's Legislative Council.

Hong Kong legislator Ted Hui Chi-fung called the “deportation” of former foreign affairs chief Albert del Rosario “unreasonable” and “barbaric,” which he also used to describe the incident involving former Ombudsman Conchita Carpio Morales in May.

“I will formally question the [Hong Kong] government in the Legislative Council about the 2 Philippine cases, to [put] more pressure from the public on Beijing,” he told CNN Philippines on Sunday.

Similar to Morales' ordeal last month, Del Rosario was held up at the Hong Kong International Airport for hours on June 21, with the immigration officers questioning him and refusing to allow him entry. He was travelling on a diplomatic passport.

Both ex-officials said they were barred from entering Hong Kong due to “immigration reasons.” However, Hui suspects the reason for their deportation was political in nature.

Morales and Del Rosario filed a complaint against Chinese President Xi Jinping and other Chinese officials in March over China’s actions in the West Philippine Sea, a portion of the South China Sea claimed by the Philippines. The two former officials said the Chinese officials should be held liable for near-permanent environmental destruction which put the livelihood of Filipino fishermen at risk.

“That’s the only possible reason the public can reasonably see,” said Hui.

This also comes amid protests on the streets of Hong Kong against a controversial bill that will allow Hong Kong to extradite fugitives to mainland China.

“If this bill passes, cases like Del Rosario and Morales could be easily elevated and they could be accused of having committed an offense in China and be arrested while in Hong Kong,” Hui said. “This will allow the Hong Kong government to send them to Mainland China for trial.”

The Hong Kong official said the recent incident underscores Hong Kong's loss of independence from China, which is mandated in the Hong Kong Basic Law.

“The Hong Kong immigration has become totally controlled by Beijing, contrary to what is promised in the Hong Kong Basic Law. It appears that Hong Kong is no longer a free and open international city.”

Hui is also a member of the Democratic Party, which advocates economic cooperation with Mainland China while recognizing Hong Kong's administrative independence.

Beijing-appointed Hong Kong Chief Executive Carrie Lam has since suspended parliamentary deliberations on extradition the bill and issued a public apology in the wake of the protests. But Hongkongers continue to call for a total withdrawal of the bill.

CNN Philippines' Senior Producer Chad de Guzman contributed to this report