President Cyril Ramaphosa of South Africa is locked in a tight party leadership race with his former health minister, whom he forced to resign amid corruption allegations.
According to reports, Zweli Mkhize is enjoying a last-minute surge at the African National Congress conference in Johannesburg.
The candidates are competing for the votes of 4,426 delegates.
The victor will steer the party into the 2024 general elections.
Mr Mkhize would become ANC leader if he wins, but Mr Ramaphosa would remain president.
Mr Ramaphosa had faced calls to resign ahead of the conference over an alleged cover up of theft of a large sum of foreign currency that was hidden in a sofa at his private farm.
An independent report commissioned by the speaker of parliament said Mr Ramaphosa may have broken the law but he has denied any wrongdoing.
On Tuesday, ANC MPs were instructed to back Mr Ramaphosa and vote down an attempt to start an impeachment process. Only a handful defied the whip clearing a huge hurdle that would have locked him out of the party leadership race.
On Friday, some delegates heckled Mr Ramaphosa, with some displaying the name of his Phala Phala farm where the theft took place.
Mr Mkhize’s supporters also chanted “change” and “He [Ramaphosa] is not coming back!”
The former health minister was forced to leave office last year after allegations emerged that a communications company linked to his family benefited from a contract at the height of the Covid pandemic. He has denied any wrongdoing.
Supporters of candidates running for the party’s presidency and other six top seats have been involved in intense lobbying ahead of the vote which is expected to be completed later on Sunday.