The group of Vietnamese Christians has repatriated voluntarily despite alleged persecution in their homeland.
Kem Sokha says the Cambodia National Rescue Party will meet soon with Hun Sen’s Cambodian People’s Party.
The foreign minister claims his lawyer acted alone in pursuing the seven-year-old defamation case.
The ruling party-dominated standing committee approves his arrest and strips his immunity.
A ruling party lawmaker says he was stripped of parliamentary immunity by a 2013 conviction.
The Southeast Asian nation will hold its own general elections in July 2018.
They say worsening relations could threaten upcoming elections.
They have rounded up suspects in an incident where apparent illegal loggers killed two officials on forest patrol and wounded another.
The order comes as opposition MPs announce a boycott of parliament citing safety concerns.
A government official says the Dak Dam zone in Mondulkiri province is part of Cambodia.
But suspicions remain that others had organized the assault and the lawmakers party wants more suspects detained.
The party also wants the UN to investigate the beating of two of its lawmakers.