Rep. Jerrold Nadler Jerrold (Jerry) Lewis NadlerDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-N.Y.), the chairman of the House Judiciary Committee, is calling on Attorney General William Barr Bill BarrFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Why a backdoor to encrypted data is detrimental to cybersecurity and data integrity FBI official who worked with Mueller raised doubts about Russia investigation MORE to recuse himself from overseeing any Justice Department involvement in the growing scandal over 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 dealings with Ukraine.

“The President dragged the Attorney General into this mess. At a minimum, AG Barr must recuse himself until we get to the bottom of this matter,” Nadler tweeted.

The President dragged the Attorney General into this mess. At a minimum, AG Barr must recuse himself until we get to the bottom of this matter. #UkraineTranscript https://t.co/lBMsllCafp — (((Rep. Nadler))) (@RepJerryNadler) September 25, 2019

The call comes after the White House released a five-page memorandum of a July call between Trump and Ukrainian President Volodymyr Zelensky in which Trump said he would have Barr speak with Zelensky about opening an investigation into 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 2020 presidential candidate.

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“There's a lot of talk about Biden's son, that Biden stopped the prosecution and a lot of people want to find out about that so whatever you can do with the Attorney General would be great,” Trump said on the July 25 call. “Biden went around bragging that he stopped the prosecution so if you can look into it ... It sounds horrible to me.”

“I will have Mr. Giuliani give you a call and I am also going to have Attorney General Barr call and we will get to the bottom of it. I'm sure you will figure it out,” Trump added, referring to 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, his personal lawyer.

The memorandum shows Trump asked Zelensky to open an investigation into Biden’s role in the firing of a Ukrainian prosecutor who was investigating a natural gas company where board Biden's son sat in the board. No evidence has emerged that Biden was working with his son’s interests in mind.

Democrats have sounded the alarm over Trump's request, with some alleging that the president may have leveraged military aid to Ukraine to pressure Zelensky into compliance.

Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) announced late Tuesday that the House would launch a formal impeachment investigation over the concerns. Six House committees that were already investigating the president will continue to do so and eventually funnel their findings to Nadler’s panel, which will ultimately decide whether to draw up articles of impeachment.