Pro-democracy media tycoon Jimmy Lai is physically breaking down in a Hong Kong prison and "time is running out" for him if the U.S. and Britain do not push for his release, his son said.

Pro-democracy media tycoon Jimmy Lai's health is deteriorating in a Hong Kong prison, prompting international pleas for his release. Lai was jailed under the controversial national security law, and his son has urged the U.

Jailed HK tycoon Jimmy Lai also denied giving inaccurate testimony to the court as he maintained he was not aware of the existence of IPAC.

Prosecution grills Lai over what he knew about Inter-Parliamentary Alliance on China when he texted its founder and covered its launch in his newspaper.

As pro-democracy publisher Jimmy Lai spoke in his defense at a Hong Kong court Tuesday, his son Sebastien Lai was in Geneva calling for the United States and other world leaders to help secure this father's release.