2020 Election Live Updates: Trump Floats Whether to ‘Delay the Election,’ Something He Cannot Legally Do

The group, Everytown for Gun Safety, said it planned to spend more than $2 million on digital, radio and television advertising in both English and Spanish, starting in Texas.

The group’s advertising criticizes Mr. Trump and Senator Mitch McConnell, the majority leader, for not doing more to enact stricter gun control laws since the El Paso attack, accusing them of “empty words and empty promises.” The police said that the suspect in the shooting told them he had been targeting Mexicans and that he had left a manifesto saying he was carrying out the attack in “response to the Hispanic invasion of Texas.”

“Victory for gun sense candidates up and down the ballot is impossible without the support of Latino voters,” said Charlie Kelly, a senior adviser to the group, Everytown for Gun Safety. “We’re making it a priority to reach the Latino community this cycle with gun safety messages that we know will resonate.”

The group also released new polling showing that Latino voters are more likely to support gun control measures enthusiastically than they were before the El Paso shooting. More than two-thirds of Latino voters said they would not vote for a candidate who does not support background checks on all gun sales and indicated the issue is equally important as health care, job creation, racial equity and protecting children at the border, according to the poll, which was conducted by Equis Research, a Washington-based firm that focuses on Latino voters.

As the coronavirus spread into states that lean Republican, policymakers there have been forced to change course.

Reopening plans have been scuttled, Republican leaders in Washington have broken ranks with Mr. Trump on response policy, and the president himself eventually declared that Americans should wear protective masks.

At the grass-roots level, however, it’s not clear how much the partisan differences in people’s views of the pandemic have changed. There is some evidence of a narrowing on some fronts, but other survey data suggests that Americans disagree about the severity of the crisis as much today as they did two months ago, when people in Democratic counties were hit hardest by it.