Harris Hopes a New Playbook Will Neutralize G.O.P. Attacks on Immigration

For weeks, Republicans have pummeled Vice President Kamala Harris on immigration, blaming her for President Biden’s policies at the border.

Now, Ms. Harris, the Democratic presidential nominee, is seeking to neutralize that line of attack, one of her biggest weaknesses with voters, running a playbook that Democrats say has worked for them in recent elections and staking out her clearest position yet as a tough-on-crime prosecutor focused on securing the border.

This week, she has hit back by promising to heighten border security if elected and slamming her Republican opponent, former President Donald J. Trump, for helping kill a bipartisan border deal in Congress. And her campaign has walked back some of the more progressive positions she took during her bid for the Democratic nomination in 2019, including her stance that migrants crossing the U.S. border without authorization should not face criminal penalties.

“I was attorney general of a border state,” Ms. Harris, who was once California’s top prosecutor, said on Friday at a rally in Arizona, a swing state where immigration is a top concern for voters. “I went after the transnational gangs, the drug cartels and human traffickers. I prosecuted them in case after case, and I won.”

A day earlier, the Harris campaign released a television advertisement highlighting her pivot. The ad, targeted to voters in the battleground states, promised that Ms. Harris would “hire thousands more border agents and crack down on fentanyl and human trafficking.” It made no mention of undocumented immigrants already in the United States — a top priority for many progressives and immigration activists — although in her Arizona speech Ms. Harris stressed the importance of “comprehensive reform”