A Hong Kong court is hearing final arguments in the national security trial of former Apple Daily publisher Jimmy Lai.

Barrister Robert Pang was representing the pro-democracy media tycoon in his fight against national security and sedition charges in the Chinese territory.

Hong Kong media mogul Jimmy Lai's lawyer clashed with judges on Thursday over whether the pro-democracy newspaper founder's "armchair punditry" on social media and other platforms breached the city's national security law.