WASHINGTON: Donald Trump today named a former Goldman Sachs partner and ex-supporter of likely Democratic rival Hillary Clinton as his national finance chairman to raise funds for his general-election run for the White House.

Steven Mnuchin, chairman and CEO of private investment firm Dune Capital Management, will serve as the National Finance Chairman, Trump's campaign said in a statement.

Mnuchin brings with him an impressive list of contacts in Hollywood and Wall Street. After leaving Goldman Sachs in 2003, he formed SFM Capital Management.

Mnuchin had also financed Democratic frontrunner Clinton's presidential campaign during the 2008 election.

Trump, who has so far self-funded his primary battles, will be putting up substantial money towards the general election in November, the campaign said.

"Steven is a professional at the highest level with an extensive and very successful financial background," Trump said in a statement.

"He brings unprecedented experience and expertise to a fundraising operation that will benefit the Republican Party and ultimately defeat Hillary Clinton," he said.

Trump is gearing up to defeat Clinton, after he was declared the presumptive Republican presidential nominee.

"It's a great privilege to be working with Mr Trump to create a world-class finance organisation to support the campaign in the General Election," Mnuchin said.

The most recent Rasmussen poll indicated Trump has an edge over the former Secretary of State, the campaign said.

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