A court in Hong Kong adjourned a national security trial hearing of media mogul Jimmy Lai on Friday due to concerns about his health after his defense said he had been experiencing heart palpitations.

A Hong Kong court postponed media mogul Jimmy Lai's trial on Friday, citing his need for a heart monitor -- the second delay this week in the democracy campaigner's national security case.The Hong Kong government said Wednesday it "strongly disapproved and rejected the slanderous remarks made by external forces" regarding Lai's case.

Hailed by some as a hero and scorned by others as a traitor, Hong Kong's pro-democracy media tycoon Jimmy Lai is in the final stage of his national security trial. Closing arguments were scheduled to start on Thursday for Lai, who is accused of colluding with foreign forces under a Beijing-imposed national security law.

U.S. President Donald Trump on Thursday said he would see what he could do to help "save" detained Hong Kong media tycoon Jimmy Lai, even though Chinese President Xi Jinping would not be "thrilled."

A Hong Kong court on Friday began hearing closing arguments in the national security trial of pro-democracy media tycoon Jimmy Lai, following a one-day delay because of bad weather.