Paul Manafort is indicted by a federal grand jury on 12 counts including money laundering.
A disgraced former police chief is on trial over a 2007 charge for possession of $30,000 in counterfeit money.
The US Embassy is calling on the government to release Kem Sokha, claiming allegations were made without a shred of serious or credible evidence.
The CNRP are reaffirming its commitment to jailed leader Kem Sokha amid threats of dissolution from Prime Minister Hun Sen.
Four senior members of the CNRP are allegedly on a court blacklist for collusion.
Kem Sokha is charged with treason after being questioned by a deputy prosecutor at Trapaing Phlong prison.
Opposition leader Kem Sokha is charged with treason by the Phnom Penh Municipal Court after being questioned by a deputy prosecutor.