A federal judge will allow a conservative watchdog group to gather evidence in a lawsuit against the State Department about Hillary Clinton’s use of a personal email server, creating the possibility that State Department officials could testify in a civil lawsuit over the Democratic presidential candidate’s email practices when she was a cabinet official.

U.S. District Judge Emmet Sullivan on Tuesday granted Judicial Watch’s request to allow depositions and discovery into how and why the State Department permitted Mrs. Clinton to use a personal email server for government business while she was secretary of state. He also authorized questioning about why the server wasn’t searched as part of requests for Mrs. Clinton’s public records.

In its request to the District of Columbia federal court, Judicial Watch proposed interviews under oath with top Clinton aides and confidantes, including Huma Abedin, Cheryl Mills and information technology staffer Bryan Pagliano.

Other proposed depositions included top State Department officials such as Undersecretary for Management Patrick Kennedy and John Hackett, the official responsible for Freedom of Information issues at the agency.

“This is one of several lawsuits filed by the same right-wing group, which will stop at nothing in pursuing the Clintons, just as they have done since the 1990s” said Clinton campaign spokesman Nick Merrill.