It's 'Possible' Hillary Clinton Could Be Better President than GOP Pick, Charles Koch Says

— -- It's a nightmare scenario for Republicans, but conservative billionaire Charles Koch says "it's possible" Hillary Clinton could make a better president than the remaining candidates in the GOP primary.

Koch, one of the most influential and controversial forces in Republican politics, said in an exclusive interview with ABC News to air Sunday on "This Week" that he believed Bill Clinton was a better president "in some ways" than George W. Bush.

"In other ways, I mean [Clinton] wasn't an exemplar. But as far as the growth of government, the increase in spending," Koch said. "It was 2.5 times [more] under Bush than it was under Clinton."

Democrats have long vilified brothers Charles and David Koch and their multi-million dollar political network, but both maintain they haven't yet spent a dollar for or against any candidates in the 2016 presidential primary.

In his interview, Koch said that is a result of his disgust with the rhetoric in the Republican primary, and he even suggested Clinton could be a better choice for the country than the remaining crop of GOP candidates.

"It's possible," Koch said, but didn't say whether he could see himself supporting Clinton in the 2016 cycle.

"We would have to believe her actions would be quite different than her rhetoric. Let me put it that way," he said.

Clinton responded to Koch's comments Sunday, saying in a tweet she's "not interested in endorsements from people who deny climate science and try to make it harder for people to vote."

Tune in to ABC's 'This Week' and visit ABCNews.go.com Sunday for more from Chief White House Correspondent Jonathan Karl's exclusive interview.