(CNN) Congo opposition leader Martin Fayulu said Friday he will challenge the country's election results in court as he accused presidential winner Felix Tshisekedi of taking a "dangerous shortcut to power."

Fayulu told CNN the results from the December 30 vote are "not consistent with the truth" and vowed to go to court Saturday morning in the capital of Kinshasa.

He was widely expected to win the election but suffered a shocking defeat Thursday when the electoral commission for the Democratic Republic of the Congo announced Tshisekedi's victory.

"The results ... that my team compiled show that I won. The results from the Catholic Church show that I was leading in the poll," he told CNN in a phone interview Friday.

Congo opposition leader Martin Fayulu at his headquarters in Kinshasa.

"I will be going to the Constitutional Court tomorrow to file a case to recount the ballot, polling station by polling station, and to announce the results in the presence of witnesses."

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