A mass walk out is raising new concerns about democracy in Hong Kong. 15 opposition politicians stepped down after the dismissal of four colleagues considered a threat to China's national security. Beijing says the resignation is a direct challenge to its authority over the former British colony. The UK is accusing China of breaking its promise to preserve Hong Kong's autonomy. Can democracy survive in the semi-autonomous territory? Presenter: Mohammed Jamjoom Guests: Emily Lau - former Chairwoman, Democratic Party of Hong Kong Gordon Chang - author and conservative columnist Stephen Vines - journalist and author - Subscribe to our channel: aje.io/AJSubscribe - Follow us on Twitter: twitter.com/AJEnglish - Find us on Facebook: www.facebook.com/aljazeera - Check our website: www.aljazeera.com/ #AlJazeeraEnglish #InsideStory #HongKong #China