Republican Senate nominee Corey Stewart said that he plans to a mount a “brutal and vicious” campaign against Sen. Tim Kaine Timothy (Tim) Michael KaineDemocrats call for declassifying election threats after briefing by Trump officials Buttigieg stands in as Pence for Harris's debate practice Trump meets with potential Supreme Court pick Amy Coney Barrett at White House MORE (D-Va.).

In a Monday interview with Hill.TV’s “Rising,” Stewart slammed Kaine, who’s been in office since 2013, for not having a "single major accomplishment." Stewart said the senator has attacked him because of Kaine's lack of a record.

“We have to be very aggressive and brutal and vicious with regard to the truth,” Stewart said.

“I think that I’m going to be very aggressive. I don’t fight like other Republicans. I’m going to be fighting more like Democrats and just being very brutal.”

Earlier this month, Stewart eked out a slim victory over a more moderate GOP challenger, state Del. Nick Freitas. Stewart, the chairman of the Prince William County Board of Supervisors, has been a fervent defender of Confederate monuments as well as an ally of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE’s.

Following Stewart’s primary victory, Trump congratulated the Virginia Republican, tweeting that people shouldn’t “underestimate Corey” because he has “a major chance of winning.”

But a few Republican groups have decided not to back the GOP nominee, including the National Republican Senatorial Committee (NRSC), the Senate GOP’s campaign arm and Americans for Prosperity, a group aligned with the network of GOP mega-donors Charles and David Koch.

"We have a big map, right now we are focused on Florida, North Dakota, Missouri, Indiana. I don’t see Virginia in it," NRSC Chairman Cory Gardner Cory Scott GardnerCook Political Report shifts Colorado Senate race toward Democrat Overnight Health Care: US coronavirus deaths hit 200,000 | Ginsburg's death puts future of ObamaCare at risk | Federal panel delays vote on initial COVID-19 vaccine distribution The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting MORE (R-Colo.) told CNN following the primary.

When asked by “Rising” co-host Krystal Ball if he hopes to get support from Republican leadership, Stewart noted that he's been critical of Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ky.), but would welcome any resources.

“Well I didn’t have a lot of kind things to say about Mitch McConnell. That said I’d love to have their financial support,” Stewart said.

“At the end of the day, the [NRSC] essentially is just another super PAC. In today’s campaigns of super PAC and today’s world, I can make up for that loss of not having their support with some big donors from across the country.”

The Republican National Committee (RNC) has remained mum about whether it will back Stewart. The RNC is essentially the political arm of the White House and has previously stood behind the president’s endorsements this cycle.

Kaine is heavily favored in his reelection race in the blue-leaning state. Clinton won Virginia by more than 5 points in 2016—a bigger margin of victory than former President Barack Obama Barack Hussein ObamaThe Memo: Trump's strengths complicate election picture Obama shares phone number to find out how Americans are planning to vote Democrats' troubling adventure in a 'Wonderland' without 'rule of law' MORE. And a recent poll from Roanoke College found Kaine ahead of Stewart by 11 points.

— Lisa Hagen