Sen. Tim KaineTimothy (Tim) Michael KaineDemocrats hit Scalia over LGBTQ rights Missouri Republican wins annual craft brewing competition for lawmakers Sen. Kaine: No reason for US to 'engage in military action to protect Saudi oil' MORE (D-Va.) compared Donald TrumpDonald John TrumpTrump's top adviser on Asia to serve as deputy national security adviser United Auto Workers strike against GM poised to head into eighth day Trump doubles down on call to investigate Biden after whistleblower complaint: 'That's the real story' MORE to Richard Nixon on Sunday, saying the Republican presidential nominee's call to Russia to hack Hillary ClintonHillary Diane Rodham ClintonDemocrats go all out to court young voters for 2020 Pelosi: Whistleblower complaint 'must be addressed immediately' Election meddling has become the new normal of US diplomacy 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.