President Biden’s reelection campaign is dispatching two former Capitol police officers to Nevada Wednesday to warn voters of the threat former President Donald Trump poses to American democracy.

Former U.S. Capitol Police Officer Harry Dunn and former Sgt. Aquilino Gonell are set to team with members of the Nevada law enforcement community to remind voters of the pro-Trump Jan. 6 attack on the U.S. Capitol — including his vow to pardon some of the rioters — that have become a central part of the campaign.

Mr. Biden defeated Mr. Trump in Nevada in the 2020 presidential race by more than two percentage points.

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The Biden campaign is making it clear that it intends to make the most of the role Mr. Trump played in inciting the violent attack on the Capitol.

The Nevada event will come a day after the Biden campaign sent actor Robert De Niro, Mr. Dunn and former Washington Metropolitan Police Department officer Michael Fanone to New York to hold a press conference outside the Manhattan court building where closing arguments were being made in the Trump hush money trial.

Mr. De Niro is featured in a new “Snapped” ad the Biden campaign released last week.

In the ad, Mr. De Niro warns that Mr. Trump, if he is elected, will be more unhinged than he was in his first go-round.

“From midnight tweets to drinking bleach to tear-gassing citizens, and staging a photo op, we knew Trump was out of control when he was president,” Mr. De Niro says in the ad.

“Then he lost the 2020 election — and snapped. Desperately trying to hold onto power. Now he’s running again. This time threatening to be a dictator. To terminate the Constitution,” he says. “Trump wants revenge. And he’ll stop at nothing to get it.”