WATCH: Harris focuses on middle class in opening remarks of debate with Trump

Vice President Kamala Harris promised to build an “opportunity economy” that would support young families with tax credits and small businesses during her opening remarks in her first debate with former President Donald Trump.

Harris slammed Trump’s proposed tariffs, calling it a “sales tax” that would raise costs for American families.

“Economists have said that that Trump sales tax would actually result, for middle-class families, in about $4,000 more [in taxes] a year,” Harris said.

Harris and Trump met for their first and possibly only debate on Sept. 10, 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.