In March 2005, Sihanouk accused Thailand, Laos, and Vietnam of encroaching into Cambodian territory, through unilateral border demarcation exercises without Cambodian participation. Two months later, Sihanouk formed the Supreme National Council on Border Affairs (SNCBA), which he headed, to address these concerns. While the SRP and Chea Sim expressed support for Sihanouk for the formation of the SNCBA, Hun Sen decided to form a separate body, National Authority on Border Affairs (NABA), to deal with border concerns, with SNCBA to serve only as an advisory body. After Hun Sen signed a border treaty with Vietnam in October 2005, Sihanouk dissolved the SNCBA. In August 2007, the Cambodian Action Committee for Justice and Equity, a US-based human rights NGO, called for Sihanouk's State immunity to be lifted, so as to allow him to testify in the Extraordinary Chambers in the Courts of Cambodia (ECCC). Sihanouk responded to the call by inviting the ECCC public affairs officer, Peter Foster, for a discussion session on his personal experience under the Khmer Rouge regime. Both Hun Sen and FUNCINPEC criticized the suggestion, with the latter accusing the NGO of being disrespectful. The ECCC subsequently rejected Sihanouk's invitation.