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A Harris aide, who spoke on the condition of anonymity to discuss a trip that was still being planned, said the vice president plans to speak about border security and how, as a former attorney general of California, she took on international gangs and criminal organizations who traffic drugs, guns, and human beings. She also has long believed that the country needs an immigration system that is secure, fair, orderly and humane, the aide said.

Trump has built his campaign partly around calling for cracking down on immigration and the southern border, even endorsing using police and the military to carry out mass deportations should he be elected in November. Harris has increasingly tried to seize on the issue and turn it back against her opponent, though polls show voters continue to trust Trump more on it.

Just how important immigration and the border are ahead of Election Day was evidenced by Trump wasting little time reacting to word of Harris' trip. He told a rally crowd in Mint Hill, North Carolina, that Harris was going to the border “for political reasons” and because “their polls are tanking.”

“When Kamala speaks about the border, her credibility is less than zero,” Trump said. “I hope you’re going to remember that on Friday. When she tells you about the border, ask her just one simple question: “Why didn’t you do it four years ago?”

That picks up on a theme Trump mentions at nearly all of his campaign rallies, scoffing at Harris as a former Biden administration “border czar,” arguing that she oversaw softer federal policies that allowed millions of people into the country illegally.

President Joe Biden tasked Harris with working to address the that have caused many people fleeing violence and drug gangs in Central America to head to the U.S. border and seek asylum, though she was not called border czar.

Since taking over for Biden at the top of the Democratic presidential ticket, Harris has lamented the collapse of a bipartisan border security deal in Congress that at Trump's behest. Her campaign aide said she will use Friday's border stop to push for reviving that package, which was the toughest in a generation.

In an interview with MSNBC that aired Wednesday evening, Harris talked about reviving that legislative effort, but also helping some people in the country illegally get U.S. citizenship.

“We need a comprehensive plan," she said, "that includes what we need to do to fortify not only our border, but deal with the fact that we also need to create pathways for people to earn citizenship.”

The stop is part of Harris' larger effort to make immigration an issue that can help her win supporters, saying that Trump would rather play politics with the issue than seek solutions, while also promising more humane treatment of immigrants should she win the White House.

In June, Biden announced rules that bar when U.S. officials deem that is overwhelmed. Since then,

Despite that, a new poll by released this month found that Trump has an advantage over Harris on whom voters trust to better handle immigration. This issue was a problem for Biden, as well: Illegal immigration and crossings at the U.S. border with Mexico have been a challenge during much of his administration. The poll also found that Republicans are more likely to care about immigration.

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Associated Press writer Will Weissert contributed to this report.