U.S. Attorney for the Eastern District of New York Richard Donoghue speaks during a news conference at the U.S. Attorney's office, July 16, 2019 (Photo by Drew Angerer/Getty Images)
Washington CNN  — 

The Justice Department has assigned the top prosecutor in Brooklyn to coordinate Ukraine-related investigations, according to a memo released Tuesday to Congress, bringing a new layer of Washington supervision to an area of interest that has become a political minefield.

The move potentially gives Attorney General William Barr a way to keep a tighter rein on investigations that could be politically sensitive.

Richard Donoghue, the US attorney in the Eastern District of New York, will “coordinate existing matters” and “assess, investigate, and address any other matters relating to Ukraine, including the opening of any new investigations or the expansion of existing ones,” according to the memo, sent last month by the deputy attorney general to senior Justice Department officials.

Manhattan US attorney Geoffrey Berman is investigating Rudy Giuliani, the president’s personal lawyer, along with associates who played a role in his efforts to dig up political dirt on the Joe Biden and his son, Hunter, in Ukraine.