Douglas Connell, the chairman of Prince Charles' charity, has resigned after reports the organization was offered a donation of more than 500,000 pounds ($692,000) from a Russian banker seeking British citizenship.

Connell stepped down Wednesday after the Sunday Times alleged that Charles wrote a letter to thank the businessman, Dmitry Leus, for the offer last year. The newspaper said Charles suggested that they could meet after the pandemic.

A spokesperson for the Prince’s Foundation said, "The Prince’s Foundation understands and respects Mr. Connell’s decision to step down. We would like to thank him for all his work to date and wish him well. Dame Sue Bruce, Vice Chair, will take on the role of Acting Chair with immediate effect."

"The Prince's Foundation takes very seriously the allegations made in recent news articles and is committed to the highest ethical standards. These changes to the board of Trustees will not impact the scope or timing of the rigorous independent investigation already underway."

PRINCE CHARLES' ROYAL AIDE MICHAEL FAWCETT STEPS DOWN AMID 'GOLDEN VISA' SCANDAL

The chairman of Prince Charles' charitable foundation has resigned amid an ongoing donor scandal. (UK Pool via AP)

The Scottish Charity Regulator launched an investigation into the matter earlier this week. The report said the charity initially received 100,000 pounds from the Russian, but rejected the total sum after its ethics committee raised concerns about Leus’ background.

The allegations followed earlier claims, also reported by the Sunday Times, that the charity’s chief executive, Michael Fawcett, helped a Saudi donor secure a knighthood and British citizenship after he gave a large donation.

Fawcett, Charles’ former valet, stepped down from the charity role temporarily and an independent investigation was launched.

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Connell said Wednesday that he should accept responsibility "if it appears that serious misconduct may have taken place." 

Charles is president of the foundation but he is not involved with its governance or day-to-day activities.

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A spokesman said Charles "fully supports the investigation now under way at the foundation."

The Associated Press contributed to this report.