China is proposing to limit Hong Kong's autonomy. Why now?

According to the “One Country, Two Systems” policy, Hong Kong is an autonomous Chinese territory. But in recent years, pro-democracy activists there have resisted Beijing’s efforts to bring it under tighter control. Now, a proposed Chinese law seeks to ban what it considers “subversive” activity in Hong Kong. Amna Nawaz talks to Bonnie Glaser of the Center for Strategic and International Studies.