David Koch, one of the billionaire Koch brothers who have donated hundreds of millions of dollars to conservative causes and candidates, says he's a "social liberal."

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“I’m basically a libertarian, and I’m a conservative on economic matters, and I’m a social liberal,” Koch told ABC News’s Barbara Walters for her special “The 10 Most Fascinating People of 2014,″ which will air at 9 p.m. Sunday.

Koch backs abortion rights and gay marriage, and said he's more interested in a political candidate's views on fiscal issues, ABC reported.

“What I want these candidates to do is to support a balanced budget,” Koch said in the interview.

“I’m very worried that if the budget is not balanced that inflation could occur and the economy of our country could suffer terribly.”