Washington (CNN) Oil tycoon and conservative mega-donor Charles Koch had kind words for both Bill and Hillary Clinton in an interview Sunday, saying there was an outside chance he could support her in November.

"We would have to believe her actions would be quite different than her rhetoric. Let me put it that way," he said on ABC's "This Week" Sunday. "But on some of the Republican candidates we would -- before we could support them, we'd have to believe their actions will be quite different than the rhetoric we've heard so far."

Earlier in the interview, Koch said Bill Clinton was better than George W. Bush on issues of economic growth and government spending but did not offer a full-throated endorsement of either Clinton.

"As far as the growth of government, the increase in spending, on restrictive regulations, it was two-and-a-half times under Bush than it was under Clinton," Koch told ABC.

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