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President Donald Trump has announced that he will start to end preferential treatment for Hong Kong in trade and travel, in response to a new security law pushed by Beijing.
He described the Chinese government's moves to introduce the measure in Hong Kong as a "tragedy".
Mr Trump also said he was "terminating" the US relationship with the World Health Organization over Covid-19.
China has told the West to "stop interfering" in Hong Kong.
The territory, a former British colony, enjoys unique freedoms not seen in mainland China. But many people there see the looming security law as bringing an end to Hong Kong's special status, agreed under a 1984 agreement between China and the UK.
There are fears the proposed measure – which has sparked a wave of anti-mainland protests – could end Hong Kong's unique status and make it a crime to undermine Beijing's authority in the territory.
This week, Britain said that if China went forward with the law, it could offer British National (Overseas) passport holders in Hong Kong a path to UK citizenship.
On Friday, the UK Home Office confirmed that up to three million people with BNO status could acquire citizenship in this way – as long as they applied for and were granted a passport.
What did President Trump outline?
Mr Trump said that he no longer considered Hong Kong to be separate from China.
"China has replaced One Country, Two Systems with One Country, One System", Mr Trump told reporters in the White House's Rose Garden, in a prepared statement that attacked China on several fronts.
"This is a tragedy for Hong Kong… China has smothered Hong Kong's freedom," he said.
Mr Trump said sanctions would be imposed on Chinese and Hong Kong officials who were believed by Washington to be involved in eroding the territory's autonomy. He did not outline what form these sanctions would take.
He added that the State Department would revise its travel advisory for Hong Kong in light of "increased danger of surveillance" from China.
The president also said the US would suspend the entry of foreign nationals from China identified by the US as potential security risks. There are fears that this could affect thousands of graduate students.
No further details were given on Mr Trump's announcement that he would "terminate" the US relationship with the WHO. In April, the US president said he would halt funding to the UN agency because it has "failed in its basic duty" in its response to the coronavirus outbreak.
He accused the WHO of mismanaging and covering up the spread of the virus after it emerged in China.
The Global Times newspaper – whose views are believed to reflect those of China's leaders- called the move towards revoking Hong Kong's special status with the US "recklessly arbitrary".
Hong Kong's Justice Secretary Teresa Cheng told the BBC's Chinese Service earlier on Friday that any threat of sanctions was unacceptable.
"Are the sanctions being imposed with a view to coerce another state to change their policy…? Any such sanctions are not going to benefit anyone," she said.
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Adding a new edge to the deteriorating US-China relations
Analysis by Zhaoyin Feng, BBC Chinese
The US removing Hong Kong's special privileges sent a strong warning signal to China, which activists and protesters in the territory will welcome.
The announced measures include not only Hong Kong, but also intellectual property theft and Chinese firms listed in the US.
According to media reports, Washington is expected to revoke more than 3,000 Chinese graduate students' visas. While this accounts for only 1Read More – Source
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