A Congolese opposition candidate says there is time to save democracy in the country if elections are held on time and efforts by the president to stay in power are rejected.

Moise Katumbi said Tuesday that efforts by President Joseph Kabila and the ruling party to stall presidential elections to hold onto power amount to high treason.

Katumbi, who left Congo in May for medical reasons, says the electoral body must convene in September and a new president must be in office on Dec. 20, according to the constitution.

The election is set for November, but Kabila said last week an electoral calendar will be published only after a voter register is available. It was Kabila's first public comment on the electoral timeline. He has not discussed his political future.