African National Congress leaders weighing the future of South Africa's Jacob Zuma will decide a "matter of serious concern" on Wednesday, a senior official said, heralding what could be a bid to unseat a president besieged by corruption allegations.

Separately, the speaker of parliament said the president's state of the nation address, which had been scheduled for Thursday, would be postponed, piling added pressure on Zuma.

Zuma, whose presidency has been marred by graft scandals and economic decline, has been in a weakened position since he was replaced as leader of the ANC by Deputy President Cyril Ramaphosa in December.

The ANC has called a special meeting of its decision-making National Executive Committee (NEC) for Wednesday in Cape Town, at which analysts have said some members of the party could call for Zuma to resign.

Facing a no-confidence motion in parliament set for February 22, Zuma has survived several attempts to oust him in the past. But this time around a significant part of the ANC wants him to step down well before his second term ends mid next year.

This time around a significant part of the ANC wants him to step down well before his second term ends mid next year

ANC Deputy Secretary-General Jessie Duarte told a news conference that senior party officials who met on Monday would take a proposal to the NEC for discussion on Wednesday, but she declined to disclose the proposal.

"The NWC (National Working Committee) has discussed the issue surrounding the future of President Zuma and the matter that we had discussed will be taken to the NEC," Duarte said, referring to Monday's meeting.

She added that on Wednesday the NEC "will be discussing a matter of serious concern to all of us within the ANC, and of course a matter of great public interest to the people of South Africa."

SPEECH POSTPONED

Analysts said the proposal was likely to be on Zuma's future.

"A vote of no-confidence is not desirable, under any circumstances. Our most important consideration is that we don't believe South Africa should wish for us to embarrass the president of the republic, in any way whatsoever," Duarte said.

"We will tell you exactly what the NEC has decided post our meeting."

The speaker of parliament, Baleka Mbete, postponed Zuma's speech due on Thursday. She said she met with Zuma, who was already writing to parliament to ask for the postponement of his address.

"A new date for the state of the nation address will be announced very soon," Mbete said.

If he resigns now it would mean that he would admitting that he had done something wrong

The opposition parties had demanded that the speech be postponed until Zuma was removed from the leadership.

The rand, which has tended to strengthen on signs that Zuma could step down before his second term as president ends next year, was firmer on Tuesday.

The influential Nelson Mandela Foundation said in a statement "time is of the essence - Zuma must go". Leader of the official opposition and head of the Democratic Alliance party Mmusi Maimane said in a statement: "We need a new beginning."

On Monday, Zuma met Zulu King Goodwill Zwelithini, the influential traditional head of South Africa's biggest ethnic group in the president's home province of KwaZulu-Natal.

A Zulu royal house insider told the BusinessDay newspaper that Zuma had refused a request from the Zulu king on Monday that he resign. Zuma had declined to resign saying that "if he resigns now it would mean that he would admitting that he had done something wrong", the insider told the newspaper.

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