Deputy President Cyril Ramaphosa is taking over from Zuma at mediation talks with Lesotho ministers who disagree over the reopening of Parliament.
The tripartite coalition government of Lesotho is splintering, with its sponsor BBDP leader Jeremane Ramathebane in custody for suspected fraud.
Lesotho claims an Ethiopian is smuggling illegal immigrants into South Africa - but he denies it.
South Africa has been accused of putting undue pressure on a weak government to extract an unfair deal. Caswell Tlali reports.
Katse Dam delegate, Reatile Mochebelele is fighting extradition from South Africa to serve a 10-year sentence for fraud.