On 22 March 2013, Human Rights Party deputy president Son Soubert was denied entry into Viet Nam despite having obtained permission from the Vietnamese embassy. Soubert said he had intended to visit a museum in Ho Chi Minh city for archaeological research and visit family in Kampuchea Krom's Preah Trapaing province but was blocked at the Tay Ninh border checkpoint. He has launched a complaint asking for an explanation.