Phnom Penh Municipal Court on Monday continued to summon members of the opposition over violence at Freedom Park last month.
However, Kem Sokha, vice president of the Cambodia National Rescue Party, said he will not follow his witness summons, because he now has parliamentary immunity, following his swearing in at the National Assembly last week.
His lawyer, Chan Chen, who went in his stead, told VOA Khmer he had told the court Kem Sokha is not a suspect and does not have to appear for questioning.
The courts have continued to question opposition leaders over violent clashes between Rescue Party supporters and Phnom Penh security forces July 15.
The clashes left nearly 50 people injured and led to the arrest of seven Rescue Party lawmakers and an assistant, who were charged with insurrection and incitement of violence.
They were released on bail following a political deal between Prime Minister Hun Sen and Rescue Party President Sam Rainsy, but the case against them is still pending.