ABC/Heidi Gutman(WASHINGTON) — Reclusive billionaire David Koch, a powerful donor in American conservative politics, says he’s a “social liberal.”

“I’m basically a libertarian, and I’m a conservative on economic matters, and I’m a social liberal,” Koch told ABC News’ Barbara Walters during an interview for her special The 10 Most Fascinating People of 2014 that airs at 9 p.m. ET Sunday on ABC.

Koch, who supports abortion rights and gay marriage, said he isn’t concerned with candidates he supports who don’t share some of his views. He said his primary concern when choosing a candidate to support is their fiscal policies.

“What I want these candidates to do is to support a balanced budget,” he said. “I’m very worried that if the budget is not balanced that inflation could occur and the economy of our country could suffer terribly.”

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