Sen. Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (D-Conn.) said Friday that the Senate should investigate a planned trip from President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's personal lawyer 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 to Ukraine, where the former New York City mayor is pushing for a probe into former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE.

In a letter to Senate Foreign Relations Committee Chairman Jim Risch James (Jim) Elroy RischWhy the US should rely more on strategy, not sanctions Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump Senators blast Turkey's move to convert Hagia Sophia back into a mosque MORE (R-Idaho), Murphy called for the panel to send a query to the White House for details about Giuliani's reported efforts to persuade Ukrainian prosecutors not to abandon probes that Giuliani believes could turn up information beneficial to Trump.

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“Rudolph Giuliani, the President’s personal lawyer, has apparently held meetings with Ukrainian officials in the United States and plans to travel to Ukraine for further discussions. As far as we know, none of these meetings are being coordinated with the U.S. State Department or other government agencies,” Murphy wrote in his letter.

“Reports indicate that promises have been made regarding U.S. policy as a quid pro quo in exchange for information. Has the private foreign policy engagement of Rudolph Giuliani or other private representatives of the President led to any official foreign policy decisions, such as the recalling of the U.S. Ambassador to Ukraine?” he added.

The letter follows remarks Giuliani made to The New York Times on Thursday, where he said that he was planning to press Ukraine's incoming president not to abandon two investigations: one into the origin of the federal Russia probe and allegations regarding former Trump campaign chairman Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE's work in Ukraine, and another into Biden's 2016 demand that a prosecutor step down.

"This isn’t foreign policy," Giuliani told the Times on Thursday. "I’m asking them to do an investigation that they’re doing already and that other people are telling them to stop. And I’m going to give them reasons why they shouldn’t stop it because that information will be very, very helpful to my client, and may turn out to be helpful to my government.”

Trump is reportedly seeking information that will discredit the now-shuttered investigation into Russia's election interference, as well as information that could hurt Biden's chances in the 2020 presidential election.

Giuliani last week called for an investigation into the former vice president's actions in 2016 after the Times reported on Biden's involvement in demanding that a prosecutor be fired, despite the official being involved in a probe into a company for which Biden's son worked. Biden's campaign told the newspaper at the time that he learned only of his son's involvement through media reports.

"Biden conflicts are too apparent to be ignored and should be investigated quickly and expeditiously. But the more important question is how deep and how high did the alleged Ukraine conspiracy go?" Giuliani tweeted.