The FBI is treating everything on the private server used to run former Secretary of State Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE’s personal email account as evidence or possible evidence as part of the federal investigation connected to the machine, the bureau said in a court filing this week.

“[A]ll of the materials retrieved from any electronic equipment obtained from former Secretary Clinton for the investigation are evidence, potential evidence, or information that has not yet been assessed for evidentiary value,” the FBI said in the filing.

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Release of any of that additional information “could reasonably be expected to interfere with the pending investigation,” it added.

The FBI refused to publicly confirm other details of its investigation, and in the Monday evening filing declined to outline what, if any, laws it believes may have been broken to prompt its investigation. It also would not say who the target of the investigation is or confirm reports that multiple senior Clinton aides had been interviewed as part of the probe.

Still, the claim that all material is being treated as current or potential evidence could bode poorly for Clinton, who this week clinched the role of presumptive Democratic presidential nominee.

The FBI months ago took control of Clinton’s server, which was used to run her private email setup from her New York home throughout her time as secretary of State.

The federal bureau's filing was made in a motion trying to kill an open-records lawsuit from Vice News journalist Jason Leopold.

In addition to that filing, the FBI asked the court for permission to offer another secret declaration outlining the steps it had taken to search Clinton’s machine for documents related to Leopold’s request.