Former Secretary of State Hillary ClintonHillary Diane Rodham ClintonPelosi says Capitol riot was one of the most difficult moments of her career Hillary Clinton calls for women to 'repair' COVID-19's 'damage' on women's rights Hillary Clinton says she hopes GOP will 'find its soul' MORE blasted President TrumpDonald TrumpTrump vows 'No more money for RINOS,' instead encouraging donations to his PAC Federal judge rules 'QAnon shaman' too dangerous to be released from jail Pelosi says Capitol riot was one of the most difficult moments of her career MORE on Friday after his personal attorney Rudy GiulianiRudy GiulianiNewsmax anchor Greg Kelly to host New York radio show State sanctions Ukrainian billionaire over alleged corruption Newsmax adds Andrew Giuliani as a contributor MORE said he asked Ukraine to look into former Vice President Joe BidenJoe BidenCNN: Bidens' dogs removed from the White House Federal judge rules 'QAnon shaman' too dangerous to be released from jail Pelosi says Capitol riot was one of the most difficult moments of her career 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 CuomoAs Trump steps back in the spotlight, will Cuomo exit stage left? The Hill's 12:30 Report - Presented by ExxonMobil - FBI director testifies on Jan. 6 Capitol attack Chris Cuomo criticized for hypocrisy after he says he won't cover brother's controversy 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.