A committee of top officials from the African National Congress, South Africa's ruling party, is due to meet on Monday after its six most-senior leaders met with President Jacob Zuma, who is facing mounting pressure to step down.
The motion of no confidence in Zuma is scheduled for February 22.
In a letter to the EFF leader Julius Malema‚ Mbete had informed that "the determination had taken into account the programme of the National Assembly‚ including the state of the nation address‚ debate on the address‚ the president's reply to the debate and the tabling of the national budget on February 21".
Mr Malema was one of the first to disclose that Cyril Ramaphosa had won the race to succeed Mr Zuma as ANC leader in December.
The ANC's top leadership will today formally ask President Jacob Zuma to step down, just days before he is due to deliver the state of the nation address (Sona), which he insists on doing.
Investors associate Zuma's tenure with a period of economic decline, with growth slowing to an average of 1.5 percent a year and unemployment up to 28 percent from around 23 percent when he took office in 2009.
Ramaphosa is in pole position to win an election next year and many in the party want Zuma out so that Ramaphosa can embark on his anti-corruption agenda.
Zuma has survived several no-confidence votes during his rule thanks to loyal voting by ANC lawmakers, who form a strong parliamentary majority. Although he retains the support of a faction within the ANC, he no longer holds a top post. Zuma has denied any wrongdoing.
"We are not going to humiliate President Zuma; we are going to have a discussion on what is in the interest of the ANC and the economy", Mantashe said.
Zuma agreed to establish the inquiry into "state capture", a South African term for government corruption, last month.
"We are not going to that meeting to humiliate President Zuma or to rough handle him". This comes as a motion of no confidence hangs over Zuma's head.