South Africa's top court started hearing an appeal on Friday to have former president Jacob Zuma declared ineligible to stand for parliament in a politically charged legal showdown set to raise tensions before the tightest election in decades.
Zuma, 82, is fronting uMkhonto we Sizwe (MK), a new opposition party that has become a potential disrupter in the May 29 general ballot.
But electoral authorities have argued the graft-tainted politician should be barred from the race because of a 2021 contempt of court conviction.
The Constitutional Court in Johannesburg is called to decide on the matter after a lower court sided with Zuma in April.
Competitive election
Coming only weeks before what is expected to be the most competitive vote since the advent of democracy in 1994, the case has made some observers nervous.
Zuma's jailing in 2021 triggered a wave of unrest, riots and looting that left more than 350 people dead. There are fears of a repeat.
A few dozen MK activists, wearing the party's green and black colours, chanted and danced outside the court in a show of support for Zuma.
Some held signs reading "Vote MK party".
Inside, wearing a blue suit and tie, the spectacled politician sat behind his lawyers as they made their case.
Court's neutrality
A preliminary request by Zuma's legal team that six judges recuse themselves as "tainted by bias" was dismissed by the court.
Many in the former president's camp see the Constitutional Court as partisan.
It is the same court that in 2021 sentenced Zuma to 15 months in prison after he refused to testify to a panel investigating financial corruption and cronyism during his presidency.
The head of that panel is now the court's chief justice.
The case revolves around the interpretation of a constitutional norm barring anyone sentenced to more than 12 months' imprisonment from serving in parliament.
Sentence shortened
The electoral commission (IEC) argued the provision applies to Zuma.
Representing the IEC on Friday, lawyer Tembeka Ngcukaitobi said there was no doubt the ex-president committed a crime that made him ineligible.
"He is disqualified by the Constitution," he said.
But the political veteran's lawyers have previously successfully contended that the contrary is true, for Zuma's sentence did not allow for an appeal and was shortened by a remission.
Zuma's lawyer Dali Mpofu on Friday quoted from a dictionary defining a remission as "the cancellation of a part of the sentence".
Legal experts said it might take a few days to reach a final verdict.
Main contenders
Zuma was freed on medical parole just two months into his term.
His new party came out of nowhere to become one of the main contenders in the election.
Banking on Zuma's popularity, MK is expected to cut into the vote share of the embattled ruling African National Congress (ANC) - the ex-president's former political home.
This could push the ANC towards a return of below 50 percent for the first time in a national vote.
Short of a parliamentary majority, it would be forced to seek coalition partners to remain in power.
Struggling ANC
The ANC is struggling in opinion polls in the context of a weak economy and allegations of corruption and mismanagement.
An Ipsos poll last month credited it with 40.2 percent, the liberal Democratic Alliance on 21.9 percent and the leftist Economic Freedom Fighters 11.5 percent. MK followed on 8.4 percent.
Announcing the appeal last month, the IEC said it did not intend to "involve itself in the political field of play" but sought "clarity" to "ensure free and fair elections".
South Africans are called to elect a new parliament, which then appoints the president.
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