South Africa's powerful trades union federation Cosatu has called for President Jacob Zuma to step down.
Its Secretary General Bheki Ntshalintshali said he was no longer the "right person" to lead the country.
Anti-apartheid struggle veterans have also called on the African National Congress (ANC) to recall the president.
Mr Zuma has been under growing pressure following a major cabinet reshuffle which included the sacking of respected Finance Minister Pravin Gordhan.
That led to South Africa's credit rating being cut to junk status putting more pressure on a troubled economy.
The Congress of South African Trade Unions (Cosatu), a key part of the governing alliance, says it has 1.8 million members.
It forms part of what is called the Tripartite Alliance along with the the African National Congress (ANC) and the South African Communist Party (SACP).
The SACP has also called on Mr Zuma to go.
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