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South African President Jacob Zuma is under pressure to resign, as top members of his own party who have the power to remove him consider their next step.
His presidency has covered more than a third of South Africa's time after apartheid, but it has been dogged by scandal.
So what has happened to bring us to this point? Here's a timeline of the key events.
At this point, Mr Zuma had been a popular and charismatic deputy president of South Africa for six years - but he lost his job after being implicated in a corruption trial.
He had long been viewed as a possible successor to then-President Thabo Mbeki.
As a teenager, he had joined the fight against apartheid with the African National Congress (ANC) and its underground military wing before being jailed on Robben Island with Nelson Mandela.
In 1997, he became the deputy president of the ruling ANC, and was then named as South Africa's deputy president in 1999.
Later, he became embroiled in controversy over a 30bn rand ($5bn; £3bn in 2009) arms deal involving a number of European companies.
Mr Zuma's financial adviser, Schabir Shaik, went on to be found guilty of corruption and fraud.
During the trial, Mr Zuma was implicated in the corruption allegations, and while he has always denied the claims, he lost his job. He was charged in 2007.
Mr Zuma's race for the presidency was in its last stretch when prosecutors dropped the charges against him over the arms deal.
South Africa's chief prosecutor said phone-tap evidence suggested the 2007 charges had been politically motivated.
The main opposition called it an "abuse" of the prosecutor's role. However Mr Zuma, by then the president of the ANC, went on to win the presidency of the country two weeks later.
This satellite image from 2013 shows the improvements made to Mr Zuma's property
South Africa's highest court ruled that Mr Zuma had violated the constitution when he failed to repay government money spent on his private home.
An anti-corruption body found he had spent $23m (£15m) on his rural home in Nkandla in the KwaZulu-Natal province, adding a swimming pool and amphitheatre. He later repaid the money.
Not for the first time, he faced calls to stand down.
Not for the last time, he didn't.
South Africa's Supreme Court of Appeal ruled that Mr Zuma must face 18 counts of corruption, fraud, racketeering and money laundering relating to the 1999 arms deal.
This all came about because the opposition Democratic Alliance brought a case before a Pretoria court, demanding that the president face charges. Mr Zuma lodged an appeal, but lost it.
First of all, a Pretoria court ordered Mr Zuma to set up a judicial inquiry into corruption claims against him and his associates, which he eventually did in January.
The inquiry was one of the recommendations made by the country's anti-corruption watchdog to curb state influence-peddling, which the president had tried to challenge.
Judge Dunstan Mlambo described Mr Zuma's attempt to challenge the rulings as "ill-advised" and an abuse of the judicial process.
Then, separately, a judge ruled the president had abused the judicial process by trying to block a report on corruption.
The figures that keep appearing in allegations against Mr Zuma are the wealthy Indian-born Gupta family, who are accused of using their relationship with the president to influence cabinet appointments and obtain lucrative government contracts.
The Guptas and Mr Zuma deny any wrongdoing but the allegations will not go away.
In the race to succeed Mr Zuma after 10 years as head of the ANC, Cyril Ramaphosa - South Africa's deputy president - came out on top. He took over the party at a time it was losing popular support under Mr Zuma.
He campaigned as the anti-Zuma candidate, promising to target corruption. His victory put him in a position of strength over the president, and made him a leading candidate to succeed him.
Mr Zuma's presidency has - at most - 14 months left to run. He can't run again - South Africa has a two-term limit - and the next elections are scheduled for April 2019.
In truth, it may be over even sooner: since Mr Ramaphosa took over the reins of the ANC, the pressure on Mr Zuma has grown considerably.
The ANC's National Executive Committee had been expected to make a final decision on his future on Wednesday, but that meeting was postponed after "fruitful" discussions were held with him.
Those discussions came after Mr Zuma's state of the union address, scheduled for Thursday, was cancelled in an unprecedented move.
And on Tuesday, the Nelson Mandela Foundation, for the second time, urged Mr Zuma to step down.
South Africa had seen "systematic looting" under Mr Zuma's rule, and he "must go sooner rather than later", the foundation said in a statement.
After being such a key player in South African politics for so long, his presidency is now staggering to a fractious, and perhaps humiliating, end, says the BBC's Andrew Harding in Johannesburg.
