Bill Hayton, author of “Vietnam: Rising Dragon,” says that the Vietnamese now fear Cambodia will become “a satellite of China.”
The Cambodian government wants the United Nations to close its human rights office in Phnom Penh.
Clinton also said Cambodia could find creative means of repaying more than $400 million in debt incurred during the Lon Nol regime.
Ou Virak is on a two-week trip to the US, where he met with senior State Department officials and representatives of Congress.
Prime Minister Hun Sen and his Thai counterpart met on the sidelines of a UN-Asean summit in Hanoi on Thursday.
Clinton will arrive in Cambodia Saturday and stay through Monday.
Soun Sophoan, who attempted to lead 30 activists toward Ban's motorcade, remained in serious condition on Thursday night.
Pung Chiv Kek, founder of the rights group Licadho, said Cambodia must appreciate the meaning of the Paris Peace Agreement of 1991.
Rights groups and other residents have looked for him to address what they say is a deteriorating rights situation in Cambodia.
Residents said in a letter they wanted “to stop the forced eviction from their homes and lands.”