South African President Jacob Zuma is under growing pressure to step down.
He and senior members of his African National Congress (ANC) party held talks on Sunday, and party leaders are to hold an emergency meeting on Monday.
South African media report that Mr Zuma has defied his party and refused to resign as leader, but details of their meeting have not been released.
Mr Zuma, who faces corruption allegations, was replaced as ANC leader by Cyril Ramaphosa in December.
Julius Malema, an opposition leader and former ANC member, said on Twitter that Mr Zuma had refused to stand down.