US Vice President Kamala Harris and former President Donald Trump headed to political battleground states on Wednesday looking for any edge they could find six days before a presidential election that could be the closest in decades.

Harris, the Democratic nominee, and Trump, her Republican challenger, both appeared in the mid-Atlantic state of North Carolina before heading to the upper Midwest state of Wisconsin, with Harris also campaigning in another key state, eastern Pennsylvania .

The three states are among seven, along with Michigan in the Midwest, Georgia in the Southeast and Nevada and Arizona in the Southwest, that both candidates see as crucial to their chances of winning next Tuesday’s election.

Polls show that the outcome of the seven state and national elections is too close to call. Nearly 57 million people have already voted at polling stations or by mail, and tens of thousands continue to vote early, even if some voters remain undecided.

Brett Favre, a popular figure from Wisconsin, is scheduled to join Trump at his rally in Green Bay. Downstate, several musicians popular with younger audiences — Mumford & Sons, Gracie Abrams, Remi Wolf and members of the rock band The National — are slated to appear with Harris at her rally in the state capital, Madison.

During a campaign rally in Raleigh, North Carolina, Harris repeated his promise to be “a president for all Americans.”

“Unlike Donald Trump, I don’t think people who disagree with me are the enemy,” the vice president said, echoing themes from a speech she gave outside the White House Tuesday night in what her campaign described as “the conclusion” for her campaign.

Trump rallied supporters in Rocky Mount, North Carolina, vowing to end consumer price inflation while vowing, “I will stop the massive invasion of criminals into our country,” his favorite description of migrants crossing the U.S. border and Mexico.

“And I’m going to bring back the American dream,” he said. “Isn’t it beautiful?”

Tens of thousands of supporters watched Harris on the Ellipse in Washington Tuesday night as Trump held a campaign rally in Pennsylvania.

Harris pledged to work to improve people’s lives and said he would show up at the White House with a to-do list, while he said Trump was only focused on himself and would start a new term starting in January with a list of enemies.

Her speech was given in the same area where Trump addressed his supporters on January 6, 2021, shortly before a crowd stormed the US Capitol in an attempt to prevent the certification of President Joe Biden’s victory.

“Look, we know who Donald Trump is. He is the person who stood in this very seat almost four years ago and sent an armed mob to the United States Capitol to overturn the will of the people in a free and fair election,” Harris said.

Polls show the contest in a virtual heat.

Before heading to Allentown, Pennsylvania, a city with a majority Latino population, Trump spoke Tuesday at his oceanfront Mar-a-Lago estate in Florida. He described Harris as “highly incompetent … a total wreck”.

During the campaign, Harris and Trump traded frequent insults.

Trump described Harris as someone with a “low IQ” and said she would be like a “plaything” for other world leaders. “She’s going to get it all over the place,” he said.

Some of Trump’s former top advisers from his 2017-2021 term in the White House have described him as a fascist intent on governing in a second term as an authoritarian. Harris said he agreed with the characterization.

Trump turned the taunt to describe Harris in the same way.

The importance of the seven battleground states cannot be overstated.

US presidential elections are not decided by the national popular vote, but rather by the Electoral College, which turns the election into 50 state-by-state contests, with 48 of the 50 states awarding all of their electoral votes to the winner of their states. Nebraska and Maine allocate them based on both statewide vote count and congressional district.

The number of electoral votes in each state is based on population, so the largest states hold the most influence in determining the overall national outcome, with the winner needing 270 of the 538 electoral votes to claim the presidency.

Polls show Harris or Trump holding substantial or comfortable leads in 43 states, enough for each to reach 200 electoral votes or more. Barring an upset in one of those states, the result leaves the remaining seven battleground states where both Harris and Trump have held frequent rallies, largely ignoring the rest of the country for the campaign stop.

Polls in the seven states are well within the margin of statistical error, leaving the outcome in doubt in all seven.