Liberal Senator Linda Reynolds says she has engaged "leading defamation lawyers" after she was targeted by trolls over the Brittany Higgins case.
The Western Australian senator on Thursday claimed her reputation was damaged, and pointed to Ms Higgins' partner David Sharaz as a "constant participant" in the trolling.
"For the best part of the last two years I have been the subject of harassing and highly distressing trolling on social media regarding myself and my conduct in respect of events concerning Ms Brittany Higgins which has damaged my reputation and caused me, my family and my staff, considerable stress and anguish," Ms Reynolds said in a statement to AAP.
"Mr Sharaz has been a constant participant in the trolling.
"In light of the conclusion of the criminal trial and the resolution of the civil action involving Ms Higgins and the Commonwealth, I am now at liberty to take steps to vindicate my reputation and provide some truth to the matters the subject of these trolling comments."
Senator Reynolds said she would not comment further on the actions she had taken or intended to take.
Law firm Arnold Bloch Leibler confirmed it was advising Mr Sharaz, but said it would not comment any further on the matter.
Perth firm Bennett, which is reportedly representing Ms Reynolds, has been contacted for comment.
