The DA's presiding officer of federal council elections, Desiree van der Walt, has written to four of the party's candidates to stop public campaigning for the role.
A massive showdown is expected this weekend when former party leader Helen Zille goes up against DA federal chairperson Athol Trollip to replace outgoing federal council chairperson James Selfe.
While the election has been largely described as a two-horse race, Thomas Walters and Mike Waters have also been nominated for the crucial role, which has been likened to the ANC's secretary general position or that of political CEO of South Africa's second-largest political party.
"It is an internal party election. We do not really want people to go out and canvass voters and the public," Van der Walt said at a media briefing at the party's headquarters in Bruma, on the East Rand of Gauteng, on Wednesday.
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Van der Walt said the DA needed to put the country first to turn around its weakening economy, restore state capacity and make sure order is restored in numerous communities.
"The democratic project is under threat and we cannot afford further setbacks and the DA has a vital role in ensuring that the country walks the path towards prosperity and builds one South Africa for all," said Van der Walt.