<span style="color: #222222;">China has warned that it will not sit by and watch the unrest unfolding in Hong Kong, as US President Donald Trump expressed concern over the risk of a violent response to pro-democracy protests.</span><br />'' <br />'' <span style="color: #222222;">Earlier, Trump urged his Chinese counterpart Xi Jinping to meet with demonstrators, while US National Security Advisor John Bolton warned Beijing against creating a new Tiananmen Square in Hong Kong, referring to the deadly 1989 crackdown on protesters in Beijing.</span><br />'' <span style="color: #222222;"><br />'' In an interview with VOA News published yesterday, Bolton also said that people in America remember Tiananmen Square.  He  warned China that it would be a big mistake to create a new memory like that in Hong Kong.<br />''<br />''The weeks-long Hong Kong protests were sparked by opposition to a plan to allow extraditions to the mainland, but have since morphed into a wider and sometimes violent call for democratic rights.</span><br />