South African President Jacob Zuma's state of the nation speech in parliament has been postponed, as pressure grows on him to resign.
Parliament speaker Baleka Mbete made the announcement, without giving a new date for the address that had been scheduled for Thursday.
The ruling ANC earlier called a meeting of the party's top body for Wednesday to decide the president's future, reports BBC.
Mr Zuma, 75, has resisted calls to quit over corruption allegations.
He was replaced as party leader by his deputy, Cyril Ramaphosa, 65, in December. He is now the front runner to succeed him as president.
Earlier on Tuesday, the Nelson Mandela Foundation urged Mr Zuma to step down.
South Africa had seen "systematic looting" under Mr Zuma's rule, and he "must go sooner rather than later", the foundation said in a statement.
In a statement, Ms Mbete said recent "calls for disruption" of a parliament meeting on Thursday "caused us great concern".
Therefore the decision had been taken, she said, to "create room for establishing a much more conducive political atmosphere in parliament".
She said that "with this in mind", Mr Zuma was approached about postponing the address, but "when we met the president, we then learnt that he was already writing to parliament to ask for the postponement".
South Africa's main opposition parties, the Democratic Alliance (DA) and the Economic Freedom Fighters (EFF), had been pushing for the postponement of Mr Zuma's speech.
They both welcomed the Tuesday's announcement.
On Monday, senior ANC officials held an emergency meeting in the main city, Johannesburg, to discuss his future.
A "dominant view" emerged from the meeting, but it "wasn't the only view", ANC deputy secretary-general Jessie Duarte said at a media briefing.
She refused to go into details, saying the party's National Executive Committee (NEC) will make a final decision on Mr Zuma's future on Wednesday.
If the committee agrees to recall Mr Zuma, the BBC's Andrew Harding says, it would be very hard for him to resist.
Mr Zuma, who spent time in prison for his part in the fight against apartheid, met the ANC's top six on Sunday. They are said to have failed to convince him to stand aside.
Other unconfirmed reports from Sunday's meeting say that Mr Zuma asked for protection from prosecution for himself and his family.
Mr Zuma's presidency has been overshadowed by allegations of corruption.
In recent years his links to the wealthy India-born Gupta family, who are alleged to have influenced the government through their relationship with Mr Zuma, have caused his popularity to plummet. In South Africa, it has become known as "state capture".
Both Mr Zuma and the Guptas deny the allegations.
