The Supreme Court then opened an investigation which was dubbed the "Proceso 8000". Serpa defended Samper against these allegations of drug money entering the campaign in which he was also involved. The relations with the United States government a major contributor to the drug effort in Colombia deteriorated. Samper and most of his collaborators were absolved from any wrongdoing with the exception of Fernando Botero and Santiago Medina. But the scandal involved a dozen members of Congress and numerous politicians and businessmen with the Cali cartel. After this incident Serpa's credibility maintained a low level with Colombians for supporting Samper, as well as responding to criticism with aggravating words.