JOHANNESBURG (Reuters) - South Africa’s main opposition party has called for an independent inquiry into a $36,000 payment made to a fund that financed President Cyril Ramaphosa’s successful campaign for leader of the African National Congress last year.

President Cyril Ramaphosa addresses the members of the South African Foreign Correspondents Association in Johannesburg, South Africa November 1, 2018. Gianluigi Guercia/Pool via REUTERS

Ramaphosa, who has staked his reputation on rooting out corruption, told lawmakers this month that the 500,000 rand payment by facilities management firm African Global Operations was for consulting work done by his son.

On Friday, Ramaphosa said he had inadvertently misled parliament and that the money was used to support his candidacy in the ANC leadership race which he narrowly won last December.

The disclosure is uncomfortable for Ramaphosa as he is trying to restore public confidence in the ANC ahead of a national election next year. His spokeswoman said he had done nothing illegal or irregular.

Ramaphosa’s close ally, Nhlanhla Nene, resigned as finance minister in October after admitting to lying over the number of times he had met the Gupta family, friends of former president Jacob Zuma who have been implicated in a far-reaching influence-peddling scandal but who deny wrongdoing.

Democratic Alliance party leader Mmusi Maimane said there should not be “double standards” over the payment to Ramaphosa’s campaign fund. He wants Ramaphosa to appoint an inquiry headed by a retired judge selected by the country’s chief justice.

“Ramaphosa has appointed independent inquiries to investigate corruption elsewhere. Now the same standard must apply to him and his family,” Maimane said in a statement.

Seeking to defuse the controversy surrounding the donation, Ramaphosa’s campaign team said over the weekend that it would return the money and that it would audit other donations to ensure that they were “above board”.

Explaining why the campaign team had decided to pay back the money, Ramaphosa’s spokeswoman Khusela Diko said on Monday: “They did not want to put the president in a position where there seem to be dubious payments that would have led to his election.”

“There is nothing illegal, there is nothing irregular and the president has not lied to parliament. He gave the information as he understood it at that particular moment in time,” Diko told Kaya FM radio station.

Reuters could not reach Diko to ask whether the president would appoint the inquiry called for by Maimane.

Spokesmen for African Global Operations and the ANC did not answer their phones.