He had come in third in presidential elections in October 2020 that were won by Arce, a Morales protege.
The charges against Camacho echoed the 2021 arrest of former president Jeanine Anez, who was given a 10-year prison term in June 2022 for allegedly plotting the toppling of Morales, her predecessor.
The alleged plot is dismissed as fictional by many, and Anez has consistently denounced what she calls political persecution.