Sen. Tim KaineTimothy (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.) compared Donald TrumpDonald 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 to Richard Nixon on Sunday, saying the Republican presidential nominee's call to Russia to hack Hillary ClintonHillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE's emails is on par with the Watergate break-in. 

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"A president was impeached and had to resign over an attack on the DNC during the presidential election in 1972. This is serious business," Kaine, the Democratic vice presidential nominee, said on ABC's "This Week," referring to a hack this summer of the Democratic National Committee's computer systems that many attributed to Russian state actors. 

Kaine said Trump "has openly encouraged Russia to engage in cyber hacking to try to find more emails or materials, and we know that this cyberattack on the DNC was likely done by Russia." 

Kaine was referring to a comment Trump made at a news conference in July when he said, "Russia, if you're listening, I hope you're able to find the 30,000 emails that are missing." Trump was referring to the emails Clinton, now the Democratic presidential nominee, deleted from the private email server she used while secretary of State, claiming them as personal in nature.