Hong Kong police use tear gas and a water cannon against protestors

Hong Kong police on Sunday used tear gas and a water cannon against protestors gathered to oppose pending Chinese legislation that some, including the U.S. government, say would threaten Hong Kong's autonomy.

"Stand with Hong Kong," "Liberate Hong Kong," and "Revolution of our times," were among the slogans that protestors chanted, according to the Associated Press. 

The outlet reported that at least 180 were arrested in large part on charges of unlawful assembly, according to police, who also said that some protestors lobbed bricks and splashed an unknown liquid at authorities, hurting at least four people on the police media liaison team.

Chinese Foreign Minister Wang Yi claimed that the legislation "does not affect the high degree of autonomy in Hong Kong."

“It does not affect the rights and freedoms enjoyed by Hong Kong residents," he reportedly said. "And it does not affect the legitimate rights and interests of foreign investors in Hong Kong.

But U.S. Secretary of State Mike Pompeo has described it as "a death knell for the high degree of autonomy" that Beijing previously pledged Hong Kong would enjoy.

On CBS’s Face the Nation, U.S. National Security Adviser Robert O’Brien also addressed the situation.

"I can’t see how Hong Kong remains the Asian financial center if the Chinese Communist Party goes through and implements this national security law and takes over Hong Kong,” O’Brien said.