Former Secretary of State Hillary ClintonHillary Diane Rodham ClintonGroups seek to get Black vote out for Democrats in Georgia runoffs Biden's political position is tougher than Trump's Valadao unseats Cox in election rematch MORE blasted President TrumpDonald John TrumpPennsylvania Supreme Court strikes down GOP bid to stop election certification Biden looks to career officials to restore trust, morale in government agencies Sunday shows preview: US health officials brace for post-holiday COVID-19 surge MORE on Friday after his personal attorney Rudy GiulianiRudy GiulianiKrebs says allegations of foreign interference in 2020 election 'farcical'  Trump campaign loses appeal over Pennsylvania race Krebs: I'm 'most upset' I didn't get to say goodbye to my team MORE said he asked Ukraine to look into former Vice President Joe BidenJoe BidenPennsylvania Supreme Court strikes down GOP bid to stop election certification Biden looks to career officials to restore trust, morale in government agencies Biden transition adds new members to coronavirus task force MORE.

“The president asked a foreign power to help him win an election. Again,” Clinton, the 2016 Democratic presidential nominee, tweeted.

Clinton was responding to Giuliani's interview on CNN the previous night in which he said "of course" he asked Ukraine to look into Biden, the current Democratic presidential front-runner for 2020.

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The former secretary of State and 2016 Democratic nominee also appeared to be referencing one of Trump’s 2016 campaign stops in which he encouraged Russia to look for Clinton’s emails from a private server.

“Russia, if you're listening, I hope you're able to find the 30,000 emails that are missing. I think you will probably be rewarded mightily by our press,” Trump said in 2016. 

Giuliani gave CNN’s Chris CuomoChris CuomoMedia and Hollywood should stop their marching-to-Georgia talk Clyburn: 'We're teetering on' giving president 'authority to be dictator' The 'Anonymous' saga ended with a dud — a perfect example of the problem of Trump-era media MORE conflicting answers on Thursday night as to whether he asked Ukraine to investigate Biden’s reported connection to the country, initially denying that he asked Ukraine to investigate the former vice president before seconds later saying he did.

In 2016, while he was vice president, Biden threatened to withhold $1 billion in U.S. loan guarantees unless Ukraine removed a top prosecutor, The New York Times reported.

The Ukrainian prosecutor, who was later voted out on corruption allegations, was looking into an energy company whose board included Biden’s son Hunter. While Joe Biden did push for the prosecutor's dismissal, the move reflected the position of several other Western countries.

Giuliani said last month that he had spoken to a Ukrainian official about Biden’s reported role in the prosecutor’s dismissal.

"The only thing I asked about Joe Biden is to get to the bottom of how it was that Lutsenko ... dismissed the case against AntAC," Giuliani said, referring to former Ukrainian prosecutor General Yuriy Lutsenko and the Ukrainian-based Anti-Corruption Action Centre.