The ANC expressed concern on Thursday over statements by political parties calling on the Electoral Commission of SA's chairwoman Pansy Tlakula to resign.

"The African National Congress reaffirms its confidence in the commitment, willingness and expertise of the IEC as a whole, led by its chairperson, to deliver credible, free and fair elections," spokesman Jackson Mthembu said in a statement.

"Any calls therefore for the resignation of the IEC chairperson, we view as opportunistic, malicious and designed to cast doubt over the credibility of the general election of 2014."

Opposition parties have said they are worried about the credibility of the May 7 elections. The parties met the IEC's management at a Pretoria hotel on Tuesday.

The forum of opposition parties met to discuss Public Protector Thuli Madonsela's finding on security upgrades to President Jacob Zuma's private Nkandla homestead and controversy around Tlakula.

The forum consists of the African Christian Democratic Party, AgangSA, the Azanian People's Organisation, the Economic Freedom Fighters, Freedom Front Plus, Inkatha Freedom Party, United Christian Democratic Party, and the United Democratic Movement.

At a media briefing with the forum on Tuesday, EFF leader Julius Malema called on Tlakula to resign.

"It is in the interest of the unity of this country, to avoid the possibility of civil war and disputed election results. She has seven days to step down or appropriate action will be announced regarding what is going to follow," he said.

Mthembu said the "threats of a civil war" was a dangerous statement to make.

"The ANC calls upon all South Africans to reject attempts to delegitimise the IEC and thus create an environment that casts aspersion on its work and by necessary implication, the 2014 general election," he said.