The 75-year-old Zuma has been South Africa's most controversial president since the end of white-minority rule in 1994, overseeing a troubled nine years marked by economic decline and numerous allegations of corruption.
South Africa's deputy president, Cyril Ramaphosa, on Wednesday vowed a "speedy resolution" to talks on the future of embattled leader Jacob Zuma, expected to step down after mounting political turmoil.
It would need to call a meeting of the National Executive Committee to force Zuma to quit.
Zuma took power in 2009 but has been in a weakened position since Ramaphosa replaced him as ANC leader in December.
The speaker of parliament has said Zuma, who is under intense pressure to resign, will not give the state of the nation address in parliament that had been set for Thursday and the ruling ANC announced the postponement of a meeting Wednesday to discuss the president's fate.
They've started calling it "Zexit" here - the long, fractious process of nudging President Jacob Zuma out of his job.
"He must go because he has demonstrated that he is not fit to govern".
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Pence arrived Tuesday in Japan, where he will meet with Prime Minster Shinzo Abe and US service members. South Korean soldiers are testing their tolerance for the cold and snow.
Bongani Ngqulunga said a full cabinet meeting was scheduled for February 14, dismissing speculation in domestic media the embattled president had called a meeting to discuss his future with his cabinet colleagues. "Some things can not be pardoned", it added in a statement.
Today 's meeting is a rare gathering as the ANC parliamentary caucus usually does not hold meetings until the delivery of Sona by the president, which also marks the official opening of the legislature.
Additionally, Dube said: "The Constitution basically says that he (the deputy president) is completing the term of the president that is stepping down and in that sense it is not regarded as his own term so that leaves him free to contest in the next two elections".
But the NEC meeting (scheduled for Wednesday), which Mashatile assured investors was being held to recall Zuma was called off at the last minute on Tuesday. They are said to have failed to convince him to stand aside then. Ramaphosa also led South Africa's delegation to the World Economic Forum in Davos, Switzerland last month, mixing with heads of state and trying to assure investors that the country is emerging from the turmoil that briefly sent it into recession previous year.
The National Prosecuting Authority is due to decide within weeks whether Zuma will face multiple charges of bribery and corruption related to an arms deal in the 1990s.
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.