Ms Gillard's defense in parliament in October of Mr Slipper prompted a heated exchange between her and opposition leader Tony Abbot, in which Ms Gillard lambasted Mr Abbot as a misogynist.
Court papers show Ms. Lee has received immunity from prosecutors in exchange for her testimony as a witness at next week's trial of former campaign treasurer Jia "Jenny" Hou and fundraiser Xing Wu "Oliver" Pan.