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The Eastern Cape ANC has rejected the outcome of a unanimous vote by the OR Tambo region in Mthatha for Deputy President Kgalema Motlanthe to lead the party.
Provincial secretary Oscar Mabuyane says the meeting by the ANC's second-largest region on Wednesday was irregular and not properly convened.
The Eastern Cape ANC was due to nominate leaders for the party's national elective conference in Mangaung in December, at the University of Fort Hare, in Alice, on Thursday.
The conference was postponed to today to allow the party time to verify the credentials of delegates.
Earlier this month, the ANC in the Eastern Cape was hit by reports of "ghost members" on its membership book.