Geoffrey Mwamba, vice-president of the United Party for National Development (UPND), who was arrested on March 3, appeared in court together with 21 party members alleged to have been undergoing militia training.
“My lady, I deny the charge,” Mwamba told the magistrate after being asked to plead. The trial is due to start on May 3.
Political tensions are mounting in the southern African nation before presidential, parliamentary and local elections in Aug. 11. Analysts say Lungu faces a serious challenge from UPND leader Hakainde Hichilema.