The impact of Caldwell's visit to Cambodia and his murder was muted by the Vietnamese invasion of Cambodia three days later on December 25, 1978, which soon ended the rule of the Khmer Rouge. Support for the Khmer Rouge in the Western academic community of Cambodian scholars quietly faded away. Peter Rodman, an American foreign policy expert and public official, stated that "When Hanoi [Vietnam] turned publicly against Phnom Penh, it suddenly became respectable for many on the Left to 'discover' the murderous qualities of the Khmer Rouge — qualities that had been obvious to unbiased observers for years."