Khieu Samphan also pleaded with the court to allow the witnesses submitted by his defense team.
A preliminary hearing this week has brought the amnesty deal made in 1996, to the forefront.
In his award-winning documentary, “Enemies of the People,” Thet Sambath faces Nuon Chea and asks why some people were killed.
All four have said they are innocent of the charges against them, including war crimes, crimes against humanity and genocide.
In 1996 Khmer Rouge foreign minister Ieng Sary defected to the Cambodian government after receiving a royal pardon and amnesty.
Stephen Rapp said their trial has been a high priority for US Secretary of State Hillary Clinton.
Ieng Sary is charged with war crimes, crimes against humanity, genocide and other crimes related to the Khmer Rouge leadership.
During Cambodia’s bloody Khmer Rouge era in the 1970s, religion was outlawed.
Thailand was disappointed by the World Heritage Committee's decision to place a proposed temple management plan on its agenda.
The Thai government says its withdrawal is meant to protect the country's sovereignty.
The national and international lawyers have said they are skeptical about the interpretation of the laws governing the tribunal.
Investigating judges have been criticized for hastily concluded Case 003, without field investigations into some sites.