Rudy Giuliani contacted President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's imprisoned former campaign chairman Paul Manafort Paul John ManafortFBI official who worked with Mueller raised doubts about Russia investigation Our Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam MORE through the federal prison's lawyer several times in recent months, The Washington Post reported Wednesday.

The paper reported that Giuliani contacted Manafort for information about Giuliani's theory that Ukraine supported Hillary Clinton Hillary Diane Rodham ClintonBloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE in her unsuccessful 2016 presidential race against President Trump.

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The report comes amid allegations from a whistleblower complaint that Giuliani was part of Trump's effort to solicit foreign interference from Ukraine into the 2020 election.

The Hill reached out to Giuliani's lawyer Jon Sale for comment.

Manafort resigned from the campaign after a New York Times story revealed in August 2016 that a secret back ledger, which the paper had obtained, recorded $12.7 million in cash payments from former Ukrainian President Viktor Yanukovych's political party to Manafort, the Post noted.

Giuliani told the Post his communication with Manafort centered on figuring out the veracity of the reported ledger.

The Post reported that Giuliani’s theory is centered on allegations that the Ukrainian government interfered in the 2016 election on behalf of Clinton through a Ukrainian American contract worker for the Democratic National Committee.

In his theory, Giuliani also claims the ledger was released as part of a falsified pretext for U.S. authorities to reopen a case against Manafort.

But the Post reported that the FBI had opened a case against Manafort before the 2016 election, interviewing him in 2013 and 2014 about his work in Ukraine.

Manafort is serving a term of 7 ½ years in federal prison in Pennsylvania over tax and financial fraud that was revealed during former special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s investigation. The allegations are related to Manafort’s work in Kiev for the political party of Yanukovych, the Post noted.

Giuliani acknowledged his alliance with Manafort in interviews this week with the Post, according to the paper’s report.

The House launched a formal impeachment inquiry into Trump last week after a whistleblower complaint was filed.

A partial memo of a July 25 call between Trump and Ukrainian President Volodymyr Zelensky shows Trump asking the foreign leader to investigate former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE, a leading 2020 candidate.