Umkhonto WeSizwe Military Veterans Association
MKMVA president Kebby Maphatsoe said the call for Zuma to step down must be avoided by the newly elected national executive committee (NEC).
The public protector and minister of police are under fire and Telkom has cut its ties with KPMG.
As many as 35 to 40 ANC MPs could have voted with the opposition.
"We have also decided to increase the NEC to 32 in order to accommodate more women."