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"Impartial enforcement of the law is essential to give the American public confidence in the Justice Department's work. Your personal connection to these matters creates the appearance of a conflict of interest and gives rise to questions about whether the Department is being used to advance the president's personal interests," the senators wrote.

"We request that you recuse yourself and identify the appropriate official who will be responsible for these matters. We also request that you confirm whether you consulted Department ethics officials regarding recusal and provide copies of any ethics guidance that Justice Department officials have provided in connection with these matters," they added.

"The White House's memorandum of President Trump's July 25 phone call with Ukraine President Zelensky suggests that you may have personal knowledge or involvement in President Trump's request that Ukraine pursue investigations to serve the president's personal political interests," the Democrats wrote.

They added that Trump name-dropping Barr during the call "raises legitimate questions about your knowledge of the activities of Mr. Giuliani and others, as well as the actions that you have taken and your discussions with the president and the White House about these investigations."

Democrats on the Senate Judiciary Committee are calling on Attorney Generalto step back from Ukraine-related matters and an investigation into the origins of the probe on Russian election meddling and the Trump campaign.The New York Times reported earlier this month that federal prosecutors in Manhattan are reportedly investigating whether Giuliani's dealing with Ukraine broke lobbying laws. Meanwhile, Parnas and Fruman were arrested earlier this month on campaign finance violation charges.