Presumptive Republican presidential nominee Donald Trump has told would-be donors that he wants former Goldman Sachs banker Steven Mnuchin to serve as his Treasury secretary, according to a Tuesday report in Fortune.

Mnuchin, the CEO and chairman of hedge fund Dune Capital Management LP, was appointed as Trump's national finance chairman in May despite being a onetime donor to Hillary Clinton and President Barack Obama.

SkyBridge Capital founder Anthony Scaramucci, who has been raising money for Trump and revealed the candidate's comments, said that Mnuchin should get more credit for fundraising despite the campaign's slow start.

Mnuchin spent 17 years at Goldman Sachs, becoming the company's chief information officer in 1999 and leaving in 2002. In 2004, he founded Dune with financing that included $1 billion from George Soros, a prominent Democratic donor.

Trump, who is expected to be officially nominated for president Tuesday evening at the Republican National Convention in Cleveland, has named financiers Carl Icahn, Jack Welch, and Henry Kravis as possible Treasury secretaries in the past.

Mnuchin didn't immediately respond to a request for comment.

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