FILE - Pro-democracy lawmakers Au Nok-hin, in yellow helmet, and, Claudia Mo, right, argue a pro-Beijing lawmaker during a demonstration of an anti-riot vehicle equipped with water cannon by Hong Kong police at the Police Tactical Unit Headquarters in Hong Kong, Monday, Aug. 12, 2019. A Hong Kong court began mitigation hearings for prominent pro-democracy activists who were convicted under a national security law and now face up to life in prison. (AP Photo/Kin Cheung, File)