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 quash freedoms by making 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.