The Democratic Alliance's new leader, Geordin Hill-Lewis, admits the party's support is too narrow.
John Steenhuisen will not seek re-election as DA leader, leaving the race wide open for a successor.
The surprise move may threaten the stability of the coalition government of which the DA is a key partner.
One year after the formation of the coalition government, the rocky relationship teeters but avoids collapse.
The pro-business DA rejects the budget leaving the ANC to rely on other parties to get it passed in parliament.
After weeks of wrangling, the ANC and long-time rival, the DA, agree on the make-up of their coalition.
South Africa's coalition partners are at loggerheads just weeks after agreeing to share power.
South Africa's leader will have to rely on the opposition to form a government after electoral losses.
The political veteran believes he is a credible alternative to the ruling ANC party.
