US President Donald Trump on Thursday said he will give a news conference on China on Friday, as his administration moves to pressure Beijing over its treatment of Hong Kong.

Secretary of State Mike Pompeo told Congress on Wednesday that China has undermined Hong Kong's autonomy so fundamentally that the Asian financial center no longer qualifies for its special status under U.S. law.

"We'll be announcing tomorrow what we're doing with respect to China," Trump told journalists on Thursday, saying "we're not happy with China", without providing details on the course of action.  

Trump's press conference will come on the same day that Britain and the United States want the UN Security Council to meet informally behind closed doors to discuss the situation in Hong Kong, as per diplomatic sources.

The US president's comments came on a day when China approved a security law that threatens to curb Hong Kong's freedom and autonomy. 

The US-China relations hit a new low after Trump blamed China for its response to coronavirus and Washington slamming Beijing for its authoritarian measures in Hong Kong. 

Trump could take a variety of punishing measures, including imposing tariffs, limiting visas and other economic penalties.