Eng Chhay Eang says the CNRP will not attend the session because “the intention of the new rules is to narrow the CNRP’s path [to election victory].”
Last week Cambodia closed cross-border routes used by migrant workers to prevent further economic migration to Thailand and curb illicit goods smuggling.
Military government has been forced to set a six month grace period for new migrant labor laws with harsh penalties, after protests and panic among workers and employers.
The population in Cambodia’s capital city is estimated to increase by more than 50 percent, to 7.9 million by 2030.
The letters ordered the groups to halt their activities and said the Situation Room was an unregistered organization and in breach of the law.
The Licadho report went on to detail what it said was the routine shutting down of peaceful protests and inflammatory rhetoric in the run up to local elections last month.
The political parties law was amended before the election to block people with criminal records from leading political parties.
The ruling Cambodian People’s Party won 1,156 seats to the CNRP’s 489, with one seat also won by the Khmer National United Party.
They were arrested in early May last year and charged with allegedly bribing a witness in a case against opposition leader Kem Sokha.
World Heritage designation brings sites some protection from development, pollution, and other threats.
Morn Phalla told VOA Khmer he was unaware of any violence being reported during the election campaign, which he organized for the opposition.