Officials said the man did not appear to be targeting Trump or others involved in the trial
Known as the Quartet, including the powerful UGTT labour union, the team negotiated to end a political deadlock in 2013 that threatened to scuttle the North African state's political transition after the fall of autocrat Zine El-Abidine Ben Ali.
"This is a great joy and pride for Tunisia, but also a hope for the Arab World," UGTT chief Hussien Abassi told Reuters.
"It's a message that dialogue can lead us on the right path. This prize is a message for our region to put down arms and sit and talk at the negotiation table."