Álvaro Uribe Vélez, the former president of Colombia, had just finished a lecture at Georgetown University in late 2010 when a person confronted him, tossing papers. Uribe didn’t stop to pick up the documents — a subpoena for his testimony in a federal civil suit.

The plaintiffs in a human rights case want to sit down with Uribe to talk about allegations that the Colombian government illegally collaborated with the United Self-Defense Forces of Colombia, a foreign terrorist organization in the eyes of the U.S. State Department.