WATCH: Harris says she won't ban fracking

Debate moderators asked Vice President Kamala Harris why some of her policy positions have changed since she last ran for president. During her 2019 as a Democratic primary candidate, Harris said she’d support a ban on fracking, a controversial technique that involves extracting gas and oil from rock formations.

“My values have not changed,” Harris said.

Speaking during the Sept. 10 debate with former President Donald Trump, held in swing state Pennsylvania, she said was the tie-breaking vote on the Inflation Reduction Act, which opened new leases for fracking.

“My position is that we have got to invest in diverse sources of energy so we reduce our reliance on foreign oil,” she said. “We have had the largest increase in domestic oil production in history because of an approach that recognizes that we cannot over rely on foreign oil.”

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Harris and Trump met for their first and possibly only debate, hosted by ABC in Philadelphia. Harris replaced President Joe Biden as the Democratic presidential nominee this summer after Biden gave a troubling debate performance in June, increasing calls for him to drop out of the race.

According to the latest PBS News/NPR/Marist poll, more than two-thirds of Americans say they will watch all or most of the debate. While many voters have already made up their minds, 14 percent of Americans say the debate will have a great impact on which candidate they choose.