Attorneys for longtime reporter and music critic Jim DeRogatis filed it after the defense subpoenaed him to testify. The motion seeks to stop that, citing his role as an investigative reporter.
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It was DeRogatis' reporting on a sex tape sent to him 20 years ago that led to Kelly's initial indictment on child pornography charges.
The trial was supposed to resume Tuesday but the entire Dirksen Federal Building was closed due to an "operational issue."
No further details were released as to what that meant.