Former Secretary of State Hillary ClintonHillary Diane Rodham ClintonThree legal scholars say Trump should be impeached; one thinks otherwise Report: Barr attorney can't provide evidence Trump was set up by DOJ Jayapal pushes back on Gaetz's questioning of impeachment witness donations to Democrats MORE blasted President TrumpDonald John TrumpStates slashed 4,400 environmental agency jobs in past decade: study Biden hammers Trump over video of world leaders mocking him Iran building hidden arsenal of short-range ballistic missiles in Iraq: report MORE on Friday after his personal attorney Rudy GiulianiRudy GiulianiPoll: 46 percent of voters say Trump's Ukraine dealings constitute impeachable offense GOP member urges Graham to subpoena Schiff, Biden phone records Giuliani meets with fired Ukrainian prosecutor who pushed Biden, 2016 claims: report MORE said he asked Ukraine to look into former Vice President Joe BidenJoe BidenGabbard moves to New Hampshire ahead of primary Biden hammers Trump over video of world leaders mocking him Trump's legal team huddles with Senate Republicans 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 CuomoChristopher (Chris) Charles CuomoYoung Turks founder: Past remarks on women were attempt 'to be a stupid, politically incorrect Republican' Trump 2020 national spokesperson gives birth to daughter Trump tweets altered CNN clip mocking Cuomo segment 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.