Barbara Jones was appointed as “special master” by U.S. District Judge J. Paul Oetken, and will ensure attorney-client privilege is protected during the investigation into electronic devices owned by ex-President Donald Trump’s former personal attorney after FBI raids in late April.

Jones served as a Manhattan federal judge from 1995 to 2013.

Investigators are probing Giuliani’s interactions with Ukrainian figures to see if he violated a law governing lobbying on behalf of foreign countries or entities.

For more reporting from the Associated Press, see below.

Cohen eventually pleaded guilty to breaking campaign finance laws and other charges. He spent about a year of a three-year prison sentence behind bars before the spread of the coronavirus in the nation’s prisons led to his release to home detention.

The Republican and former mayor of New York City has not been charged with a crime. He has said all of his activities in Ukraine were conducted on behalf of Trump. At the time, Giuliani was leading a campaign to press Ukraine for an investigation into Joe Biden and his son, Hunter, before Biden was elected president.

Trump’s efforts to press Ukraine for an investigation of the Bidens led the House to impeach Trump, though he was acquitted by the Senate.

Prosecutors say they have successfully downloaded 11 electronic devices belonging to Giuliani and returned them to him. They say seven more devices belonging to Giuliani and others at his firm, Giuliani Partners LLC, will require more time to unlock because they lack a passcode.

A cellphone has also been seized from Washington lawyer Victoria Toensing, a former federal prosecutor and ally of Giuliani and Trump. Her law firm has said she was told she was not a target of the investigation.

As part of a written order appointing Jones, Oetken directed the government to provide Jones with copies of materials seized from Giuliani and the search warrants that preceded the searches.

He also gave lawyers for Giuliani and the government a week to consult with Jones and create a schedule and timeline for concluding the privilege review, along with a process to resolve any disputes.

Prosecutors say a similar review of materials in the Cohen raids took about four months.