The man declared the runner-up in the Democratic Republic of Congo’s presidential elections, Martin Fayulu, said on Saturday that he had filed a court challenge demanding a manual recount of the results.

Mr. Fayulu has accused the declared winner, the opposition leader Felix Tshisekedi, and President Joseph Kabila — whose party was adjudged to have won legislative and provincial elections held the same day — of making a back-room deal to divide power between them.

“You can’t manufacture results behind closed doors,” he said, telling reporters that the material for his court challenge included election results forms posted outside polling stations.