The African National Congress announced last week that Holomisa is to be charged with bringing the party into disrepute after telling the commission Public Enterprises Minister Stella Sigcau received a R50,000 cut of a R2 million bribe, allegedly paid by hotel magnate Sol Kerzner to then Transkei prime minister George Matanzima.
Sigcau, who was a member of the Transkei government at the time, has said the money was a gift and that she was cleared of any impropriety by the Alexander Commission of Inquiry.
On Tuesday the head of the Truth Commission's investigative unit, Dumisa Ntsebeza, who is also Holomisa's lawyer, came to the former Transkei military ruler's defence.
"I was quite astounded by the remarks that were attributed to the Deputy President (Thabo Mbeki) which seemed to suggest that Holomisa, before coming to the Truth Commission, should have first gone to the ANC, for the ANC to vet whatever he was going to present to us," Ntsebeza said.
"A lot is now being made about a one-line reference to Stella Sigcau rather than what he said about President de Klerk and all the other people.
"The mere suggestion that before a witness comes before us he must go to his political party to find out whether what he may say to us will make them comfortable... It is giving me a very dim view of what the political parties may come and present to us."
Commissioner Yasmin Sooka said the full commission would discuss the matter when it met on Wednesday and Thursday.
"That kind of decision could possibly have a muzzling effect on witnesses who come from political parties," she said.