Rob Messenger, who was sacked by the senator in May 2017, had earlier told the court he had made multiple complaints about Senator Lambie's office conduct, use of vulgar language, and alcohol use.

He said he was appalled by an radio interview she had given in 2014 to commercial radio where she spoke about her preference for a well-endowed man.

Senator Lambie's lawyer Nick Harrington said Mr Messenger had at the time laughed about the incident and enjoyed its international publicity.

Mr Messenger had earlier given evidence that Senator Lambie had ignored requests for office security upgrades following a death threat.

Mr Harrington said several upgrades had in fact been undertaken, including installation of shatterproof glass.

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Mr Messenger had given evidence that he attempted at all social occasions to prevent Senator Lambie from consuming alcohol in public.

Mr Harrington during Wednesday's hearing produced an emailed dinner invitation from Mr Messenger to lawyer Greg Isolani which showed the contrary.

"The invite said 'we are going to take you to dinner and get you drunk'," Mr Harrington said. Mr Messenger has claimed he had made numerous workplace complaints to Senator Lambie during the time he had worked with her, but was unable to produce emailed evidence other than exchanges from December 7, 2016.