Meanwhile, Professor of Government and International and Public Affairs at Columbia University Robert Shapiro warned that although Harris is leading in Nevada, the state is "too close to call," owing to Trump's support among voters without college degrees, who make up 27 percent of the electorate.

Donald Trump and Harris had their first debate in September after Trump initially suggested he might back out. He later blamed ABC moderators for fact-checking him during the debate when he falsely claimed Haitian immigrants in Springfield, Ohio, were eating pets. Trump whined that the debate was “three against one.”

The poll release comes in the middle of a busy campaign week in Wisconsin, with both Harris and Trump planning rallies in the next four days.