Story highlights Bryan Pagliano asked a judge to keep his immunity agreement under wraps

Pagliano helped set up and maintain Hillary Clinton's private email server

Washington (CNN) The lawyer for a former State Department IT specialist told a federal judge his client's immunity deal with the Department of Justice does not cover testimony in civil lawsuits and he will refuse to answer questions at an upcoming deposition.

The lawyer further requested that the details of that immunity deal be provided as a sealed, "ex parte" document, concealing them from the public.

U.S. District Court Judge Emmet Sullivan had requested language of Bryan Pagliano's immunity deal after learning that he intended to take the Fifth at a deposition that was originally scheduled to take place Monday but has since been postponed.

Pagliano, who helped set up and maintain Hillary Clinton's private email server, was subpoenaed by the conservative legal watchdog group Judicial Watch as part of a Freedom of Information Act lawsuit against the State Department.

He was offered an immunity deal late last year in order to offer testimony as part of an ongoing FBI investigation into the email server.

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