Democratic presidential candidates are growing increasingly comfortable labeling President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE a racist or a white supremacist, pointing to his handling of racially divisive and violent incidents in Charlottesville, Va., and El Paso, Texas.

White House hopefuls who previously focused on Trump’s equivocations in the aftermath of the August 2017 Charlottesville white nationalist rally have since expanded that criticism to include the mass shooting in El Paso, where the suspected gunman allegedly posted a manifesto denouncing an "invasion" of Latinos and reportedly told authorities he wanted to kill "Mexicans."

Democratic contenders wasted little time tying the shooter's rhetoric to Trump's own descriptions of immigrants as "thugs" and "criminals" and his characterization of migrant caravans as an "invasion."

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“[Trump] has given aid and comfort to white supremacists. He’s done the wink and a nod," Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) told The New York Times just days after the El Paso shooting that killed 22 people.

Former Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D-Texas) and entrepreneur Andrew Yang Andrew YangBiden's latest small business outreach is just ... awful Doctor who allegedly assaulted Evelyn Yang arrested on federal charges The Hill's Campaign Report: Biden weighs in on police shootings | Who's moderating the debates | Trump trails in post-convention polls MORE were among those in the 2020 Democratic field who described Trump as a white supremacist following the Aug. 3 mass shooting.

"As we saw in El Paso, Americans were killed because you stoked the fire of racists,” Julián Castro, a 2020 presidential candidate, said in an ad targeting Trump released this week. "Innocent people were shot down because they look different from you. Because they look like me. They look like my family.”

Trump’s reelection campaign argues that the ratcheting up of racism allegations is nothing more than Democrats grasping at straws.

"For two years, Democrats called President Trump a Russian agent, and now that the Russia Hoax has fallen apart, they’ve moved on to white supremacy," Trump campaign communications director Tim Murtaugh said in a statement, adding that Castro's ad was "false and ludicrous on its face."

Trump himself has dismissed the allegations of racism and instead accuses Democrats and other opponents of using the term "racist" only when they lack legitimate criticisms of his presidency.

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"I don’t like it when they do it because I am not any of those things," Trump told reporters last week when asked whether he thinks it benefits him when Democrats call him and his supporters white supremacists.

"I think it's a disgrace," he added. "And I think it shows how desperate the Democrats are."

But as Trump and his allies reject the labels as political ploys from potential 2020 challengers, they are still working to contain the fallout from the president's response to the deadly "Unite the Right" rally in Charlottesville that took place two years ago this week.

The president's comments were widely panned at the time, as he ascribed blame to both white supremacists and counterprotesters, and Democrats are banking on the incident resonating with voters into 2020 as they seek to paint Trump as unfit to lead and unable to unite the nation.

Several Democratic candidates this week marked the anniversary of the Charlottesville rally, when white nationalists marched on the University of Virginia campus chanting anti-Semitic slogans. Protesters later clashed with counterprotesters, leading to the death of Heather Heyer, who was killed after a man drove his car into a crowd.

"We all have a responsibility to condemn white nationalism — whenever we see it," Montana Gov. Steve Bullock Steve BullockCourt removes Pendley from role as public lands chief On The Trail: Making sense of this week's polling tsunami McConnell locks down key GOP votes in Supreme Court fight MORE said in a statement. "This is about the country we pass down to our kids. We deserve better than a President who sees 'good people on both sides' — and together, we can do something about it."

O’Rourke, whose hometown is El Paso, tweeted: "Two years ago, neo-Nazis marched in Charlottesville—and killed a woman named Heather Heyer. This violence has metastasized from Pittsburgh to El Paso; and the violence will continue until we defeat this hatred and the man endorsing these 'very fine people' from the Oval Office."

Former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE has made Charlottesville a central part of his campaign message. Biden's launch video in April featured scenes from the rally and described the event as a "defining moment" for America.

On the campaign trail, Biden has referenced the events of Charlottesville in his stump speech, condemning Trump over his "very fine people on both sides" remarks. In a speech earlier this month, Biden accused Trump of "fanning the flames of white supremacy."

"I said at the time we’re in a battle for the soul of this nation," Biden said in Iowa. "I said it again when I announced my candidacy. And I say here today, we are in a battle for the soul of this nation. That’s why, primarily, I’m running for president. Charlottesville was no isolated incident."

The president has been surprisingly willing to revisit his remarks that sparked bipartisan backlash.

"You had some very bad people in that group, but you also had people that were very fine people, on both sides," Trump said during an Aug. 15, 2017, press conference at Trump Tower, referencing the group of white nationalist protesters.

He added that he felt there was "blame on both sides" for the ensuing violence.

In April, Trump insisted that he answered questions about the rally "perfectly," and that he had been defending the far-right attendees protesting the planned removal of a statue of Confederate Gen. Robert E. Lee.

On Wednesday, Trump again broached the Charlottesville controversy. He retweeted a video in which former adviser Steve Cortes contended that the media inaccurately reported the president was referring to neo-Nazis and white supremacists as "very fine people."

"Thank you Steve!" Trump tweeted in sharing the video.

The president and his allies have latched onto a moment in the August 2017 press conference at Trump Tower in which Trump says neo-Nazis and white nationalists "should be condemned totally."

The ongoing defense of Trump’s Charlottesville comments show his willingness to dig in on his remarks, even in the face of widespread criticism.

Trump in recent weeks has added to his catalog of inflammatory statements by tweeting that four minority congresswomen should "go back" to where they came from, in addition to attacking Baltimore as a "rat and rodent infested mess" where nobody would choose to live.

Those incidents prompted swift backlash from 2020 presidential candidates, a seemingly intuitive response but one that could prove problematic and even distracting down the line, according to Democratic strategist Brad Bannon.

He argued that the eventual Democratic nominee will need to proceed carefully and pointed to the 2016 contest as a case study.

"Hillary Clinton Hillary Diane Rodham ClintonBloomberg 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 Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE got caught up in basically responding to the president and going through these long cycles where the president says something insulting, and Hillary Clinton responded to it,” Bannon said. "I think that was a mistake in the Clinton campaign.”

"As a Democratic strategist, I wouldn’t want to see this Democratic nominee, whoever it is, make the same mistake," he added. "So the president says something insulting, racially charged, you need to respond to it. You can’t ignore it but then you need to move on, keep your eye on the prize and focus on the bread and butter issues."