Nangaa announced in Nairobi on December 15, 2023, during the formation of the political movement known as Alliance of River Congo (AFC), that he and his colleagues aim to oust President Felix Tshisekedi’s regime.

During the announcement, he asserted that Tshisekedi had failed in his duties as the country’s President, citing issues such as unresolved insecurity in the east, resource mismanagement, disregard for the military, and alleged plans to manipulate the December 20, 2023 elections.

As the election results are still being tallied, Nangaa, based in Rutshuru, claimed on December 28 that Tshisekedi had manipulated the votes to secure an illegal second term in office. The politician expressed his support for other candidates critical of the election process and its unfolding results, denouncing it as an "electoral coup d’état" orchestrated by Tshisekedi.

He condemned the government’s deployment of numerous soldiers and police to the Haut-Katanga province, the hometown of candidate Moïse Katumbi, suggesting that this move aimed to intimidate residents opposing Tshisekedi’s victory.

In an official statement on behalf of the AFC, Nangaa accused the RDC government of ongoing atrocities in the Eastern part of the country, particularly in North Kivu, labeling it as a war crime. He asserted that Tshisekedi would be held accountable.

Nangaa called upon politicians and the Congolese people at large to unite with the AFC in expeditiously removing Tshisekedi from power and subsequently conducting a transparent election.

Corneille Nangaa has established office in Rutshuru.