Sen. Ron Johnson Ronald (Ron) Harold JohnsonThe Hill's 12:30 Report: Ginsburg lies in repose CHC leaders urge Senate to oppose Chad Wolf nomination Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy MORE (R-Wis.) said Sunday that while he does not believe 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 campaign accepted help from Russia, he remains "concerned" about Russian election interference.

"I am every bit as concerned about Russian interference as any Democratic senator," Johnson, who chairs the Senate Homeland Security and Governmental Affairs Committee, told NBC’s “Meet the Press.”

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Johnson was also asked about a New York Times report that acting White House chief of staff Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE had told then-Homeland Security Secretary Kirstjen Nielsen Kirstjen Michele NielsenMore than million in DHS contracts awarded to firm of acting secretary's wife: report DHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections MORE not to discuss Russian interference with Trump, reportedly telling Nielsen it “wasn’t a great subject and should be kept below [the president's] level."

Johnson dismissed the idea that the Trump administration did not take Russian election meddling seriously.

“DHS has been on the case. They've done a pretty successful job. We didn't see that kind of interference in 2018,” he said, referring to the Department of Homeland Security. “And I think we can rest pretty assured that the 2020 will be successful, as well.”

Asked if the responsibility for safeguarding against Russian interference goes beyond DHS, Johnson responded that “DHS has the primary responsibility, and they've done a pretty good job, under [Cybersecurity and Infrastructure Security Agency Director] Chris Krebs.”

Johnson also dismissed the idea that Russian agents could actively change vote totals, calling it “almost impossible” due to local control of elections. He noted that voter files could be more at risk, but said DHS has successfully consulted with state and local authorities to prevent such breaches.

“Let's be vigilant. Let's be concerned about it. But let's not blow it out of proportion, either,” Johnson said.