But dozens of lawmakers including numerous Uribe allies have been jailed and convicted for ties with paramilitaries, establishing a clear connection between politicians and the illegal armed groups.
President Uribe only has a few years left to complete this task, he added.
But his popularity has declined in recent years, and a broader reckoning in Colombian society over the conflict has resulted in a closer examination of his own potential role in human rights abuses.
Michael Evans, a senior analyst with the National Security Archive, said there is no indication Uribes suspected ties had any impact on U.S. assistance to Colombia, which grew significantly during his presidency.
In the conversation with Valencia, the landowner, Uribe frequently surfaced, though embassy staff didnt appear to pry for details on possible ties to paramilitaries.