South Africa's parliament is due to vote on an opposition-sponsored motion to impeach President Jacob Zuma.
The Democratic Alliance (DA) said he was no longer fit to govern after the country's highest court ruled last week that he had breached the constitution by failing to repay public money used to upgrade his private residence.
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The governing African National Congress (ANC) is expected to defeat the motion.
It denounced the impeachment proceedings as a publicity stunt.
The DA said it would demand a secret ballot, but parliamentary speaker Baleka Mbete has rejected the proposal.
Mr Zuma has been dogged by allegations of corruption since before he was elected president in 2009.
He was accused of taking bribes over an arms deal, but he denied the allegation and the charges were controversially dropped just before he took office.
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He later found himself at the centre of controversy over the use of $23m (£15m) of public money to upgrade his private home in the rural area of Nkandla in KwaZulu-Natal province.
bbc.com