Former Secretary of State Hillary ClintonHillary Diane Rodham ClintonThe two infectious diseases spreading across America Former Clinton staffers invited to celebrate Sanders dropping out: report Sanders exit leaves deep disappointment on left MORE blasted President TrumpDonald John TrumpSenators demand more details from Trump on intel watchdog firing Overnight Health Care: Trump steps up attack on WHO | Fauci says deaths could be lower than first projected | House panel warns federal stockpile of medical supplies depleted | Mnuchin, Schumer in talks over relief deal Trump says he'll look into small business loan program restricting casinos MORE on Friday after his personal attorney Rudy GiulianiRudy GiulianiThe Hill's Morning Report - Presented by Facebook - Trump: Tough times but progress being made Giuliani touts experimental coronavirus treatment in private conversations with Trump Trump team picks fight with Twitter, TV networks over political speech MORE said he asked Ukraine to look into former Vice President Joe BidenJoe BidenThe Hill's Campaign Report: Sanders exits, clearing Biden's path to nomination Former Clinton staffers invited to celebrate Sanders dropping out: report Sanders exit leaves deep disappointment on left 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 CuomoThe Hill's 12:30 Report: Sanders drops out of 2020 race Chris Cuomo slams Trump calling himself a 'cheerleader': 'Most asinine statement of leadership' CNN's Brooke Baldwin tests positive for coronavirus 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.