Democratic presidential candidate Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE said late Saturday that most Republicans are skeptical of climate change because billionaire donors David and Charles Koch tell them to be.

“Most of them are not that ill-informed,” she said during a campaign rally in Cedar Rapids, Iowa. "They just have to do what the Koch brothers tell them. They say, ‘don’t believe your lying eyes — listen to us.’ ”

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Clinton warned America’s economy would slip behind other nations if lawmakers keep debating climate change instead of acting.

“Some country is going to be the 21st Century clean energy superpower,” she said. "I think it will be China, Germany or us. I want it to be us and I hope it’s us.

"I still believe we can make things in America. We’re going to combat climate change and then we’re going to create more clean, renewable energy jobs.”

Clinton argued Republicans are so critical of her Oval Office bid because she is unyielding on clean energy and other progressive policies.

“The folks who know I have the toughest plan are the Republicans and their allies,” she said. "You’ve got to ask yourself — why are they so nervous about me?

“They know me. They know I mean what I say and say what I mean. We’re going to take the fight to them and we can. I’m a progressive who likes to get things done.”

Clinton’s remarks come as she tries fending off Sen. Bernie Sanders (I-Vt.) in the Iowa caucuses Monday. Sanders trails Clinton by about 3 percent in the Hawkeye State, according to a RealClearPolitics average of polls.