A string of violent incidents has cast a pall over the final weeks of a midterm season already marked by months of bitter partisan fighting, vitriolic rhetoric and angry protests.

A week that began with President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE spreading unfounded claims at a rally in Houston about Democrats and a caravan of migrants ended with arrests in a spate of attempted bombings against prominent Democrats and the deadliest attack on the Jewish community in the country’s history.

Both episodes were met with calls for unity from Democrats and Republicans alike, but neither party indicated they would cede an inch in the debate over responsibility for the attacks.

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Marc Hetherington, a professor of political science at the University of North Carolina at Chapel Hill, expressed skepticism that the rhetoric will cool in the last full week of the campaign, even as the country remains on edge.

“I don’t think anything’s going to cool tensions,” he said in an interview with The Hill. “This, on both sides, has the feel of the apocalypse if they lose.”

The chairmen of both parties' campaign arms in the House appeared jointly on a pair of Sunday talk shows, where they delivered a message of unity.

“We should come together as a country. This should not be a political response, but rather a response at how we can further bring us together,” Rep. Ben Ray Luján (D-N.M.), the chairman of the Democratic Congressional Campaign Committee, said on “Fox News Sunday.”

His Republican counterpart, Rep. Steve Stivers Steven (Steve) Ernst StiversGOP lawmakers distance themselves from Trump comments on transfer of power Business groups back pandemic insurance bill modeled on post-9/11 law National Retail Federation hosts virtual 'store tours' for lawmakers amid coronavirus MORE (R-Ohio), expressed confidence that the midterm elections would not prove to be an obstacle in efforts to unify the country.

Even as they spoke of bipartisanship, the two men regularly slipped in jabs about the other party's campaign operation and questioned whether their opponent’s tactics were "sleazy" or "racist."

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The back-and-forth was reflective of a national conversation in recent days where politicians have alternately called for an easing of political hostilities while quickly blaming the other side for stoking them in the first place.

At the center of it all has been Trump, who struck a unifying tone in the immediate aftermath of the attempted bombings while also questioning its timing.

“Republicans are doing so well in early voting, and at the polls, and now this ‘Bomb’ stuff happens and the momentum greatly slows — news not talking about politics. Very unfortunate, what is going on. Republicans go out and vote!” Trump tweeted on Friday, as authorities closed in on a suspect in the spate of attempted bombings.

Authorities eventually charged Cesar Sayoc Jr. with addressing more than a dozen explosive devices to high-profile Democrats, including former President Obama, former Vice President Joe Biden Joe BidenBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Joe Biden should enact critical government reforms if he wins MORE, Bill and Hillary Clinton Hillary Diane Rodham ClintonThe Memo: Trump furor stokes fears of unrest Bloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close MORE and Rep. Maxine Waters Maxine Moore WatersPowell, Mnuchin stress limits of current emergency lending programs Pelosi: House will stay in session until agreement is reached on coronavirus relief Omar invokes father's death from coronavirus in reaction to Woodward book MORE (D-Calif.), among others. CNN’s New York City offices were also targeted.

The next day, Robert Bowers was arrested after police said he opened fire in the Tree of Life Synagogue in Pittsburgh, killing 11 people and wounding six.

Democrats have seized on both incidents to draw attention to the consequences of extreme rhetoric, invoking Trump in the process.

"Honestly, I think this president’s whole modus operandi is to divide us," Rep. Adam Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE (D-Calif.) said on CNN’s “State of the Union” on Sunday. “He gets up in the morning with new and inventive ways to divide us. And it’s not enough that on the day of a tragedy he says the right words if, every day of the year, he’s saying things to bring us into conflict with each other."

Republicans, meanwhile, have been quick to downplay the connection between the president’s over-the-top rhetoric and the men responsible for last week’s violence.

“Look, everyone has their own style, and frankly, people on both sides of the aisle use strong language about our political differences, but I just don’t think you can connect it to threats or acts of violence,” Vice President Pence told NBC News in an interview aired Sunday.

“And I don’t think the American people connect it,” Pence added. “The American people believe that those who are responsible are the people that actually conduct these threats.”

George Selim, senior vice president of programs at the Anti-Defamation League, said the campaign rhetoric has reached a "tipping point."

"The rhetoric has really reached a tipping point that’s gone beyond political divisiveness into acts of cold and callous murder and intent to harm," he told The Hill.

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Democrats campaigning across the country have largely implicated both sides as they walk a tenuous line between using the events for messaging without being seen as politicizing a tragedy.

Gun-control activists have shown less hesitation to draw a direct line between Saturday’s shooting and the upcoming midterm elections.

“Americans believe that gun safety is a priority and we expect them to be taking that issue into the voting booth with them,” John Feinblatt, the president of Everytown for Gun Safety, told The Hill. “Certainly what happened in Pittsburgh is one more stark reminder, the fact that gun safety isn’t the left or right issue, it’s a life or death issue.”

Everytown spent $30 million total on the midterm elections, Feinblatt noted.

Hetherington, the UNC professor, said issues of gun violence and Trump's rhetoric are likely to be fresh in voters’ minds for the midterms, particularly since early voting has already begun in many states.

“We have a new framing in a sense for the election," he said, pointing to two issues — Trump's divisive rhetoric and gun violence — that have once again become urgent topics in the news. "And it’s on grounds that Democrats benefit from."