Opposition frontbencher Christopher Pyne says James Ashby, the former staffer of parliamentary speaker Peter Slipper, never passed information to him.
The Federal Court has been told Mr Ashby's mobile phone records show he and a colleague worked together to undermine their boss.
Julian Burnside QC, for the commonwealth, told the court in Sydney on Friday that Mr Ashby and fellow adviser Karen Doane did this while they were still working for Mr Slipper.
He said they also provided politically sensitive material to political opponents of Mr Slipper, including Howard-era minister Mal Brough.
Mr Pyne told reporters in Adelaide that he had never received information from Mr Ashby. "No, absolutely not," he said.
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"The court is hearing from Mr Slipper's lawyers and the commonwealth's lawyers today.
"If the Labor Party has any evidence of me being involved in the court action they should bring it out." In his lawsuits against Mr Slipper and the commonwealth, Mr Ashby has claimed the speaker made unwelcome sexual advances and sent him explicit text messages.
