Former U.S. Special Representative for Ukraine Kurt Volker Kurt VolkerGOP senators request details on Hunter Biden's travel for probe Yovanovitch retires from State Department: reports Live coverage: Senators enter second day of questions in impeachment trial MORE told Ukrainian President Volodymyr Zelensky before his July call with 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 that it was vital he convince Trump he was prepared to investigate the 2016 U.S. election, according to The Wall Street Journal.

Volker pulled Zelensky aside at a Toronto conference in early July and advised him to signal to Trump that he was committed to investigating both general corruption and his suspicions of interference in the 2016 election, according to the Journal. The newspaper cited a source familiar with testimony to House committees overseeing the impeachment inquiry.

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Volker told Zelensky that making such an assurance would act as a counterweight to the negative information about Ukraine that Trump’s personal attorney Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE was providing him with, according to the report.

The diplomat also suggested Zelensky at least appear to entertain some of Giuliani’s premises, such as his unfounded conspiracy theory that Ukraine hacked the Democratic National Committee (DNC) and that the DNC’s server is located in the country currently.

Volker testified that he did not mention 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 by name in his conversation with Zelensky, nor did he recommend Zelensky engage directly with Giuliani, according to the newspaper.

At the time of the Toronto conversation, the July 25 call had not yet been scheduled, although during the call Zelensky emphasized his willingness to meet with Giuliani.

“We are hoping very much that Mr. Giuliani will be able to travel to Ukraine and we will meet once he comes to Ukraine,” a summary from the White House quotes Zelensky as saying. “I guarantee as the President of Ukraine that all the investigations will be done openly and candidly.”

A few weeks later, on July 19, Volker texted Ambassador to the European Union Gordon Sondland and acting Ambassador to Ukraine William Taylor “Had breakfast with Rudy this morning—teeing up call w [Zelensky aide Andrei] Yermak Monday. Must have helped. Most impt is for Zelensky to say that he will help investigation—and address any specific personnel issues—if there are any."

The Hill has reached out to Giuliani and the White House for comment.