"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.
"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.