Claiming adherence to the rule of law, lawyers for Labor MP Craig Thomson asked the Australian Senate on Thursday to keep the Fair Work Australia (FWA) report on the alleged wrongdoings committed by Mr Thomson while serving as top-ranking Health Services Union (HSU) official private.

The Senate committee investigating the matter, according to Thomson lawyer Ian Robertson, should at least hold off the expected publication of the FWA findings, which media reports said contained palpable violations of workplace and union regulations.

The report, which was recently completed following more than three years of inquiry, was forwarded to federal prosecutors, who were then tasked to make the next move of possibly bringing charges to personalities allegedly involved in the misuse of HSU funds.

"The issue of the report being made public by a Senate committee brings into play the sub-judice convention of the Australian Parliament which says that the committee should not release the report if the release is likely to prejudice criminal or civil court proceedings," Mr Robertson told the Senate committee in his testimony last night and as reported by ABC.

His client's legal stance, according to Mr Robertson, is anchored on the valid assumption that bringing the FWA report before the public eye would inevitably attract legal prejudices against Mr Thomson, who was accused of paying for the services of prostitutes with the money entrusted to him by the HSU.

"I think it shouldn't be forgotten that legal principles such as the right to silence, the presumption of innocence, the independence of the police and regulatory authorities such as (Fair Work) Australia ... The importance of the separation of powers and the sub judice convention of the Australian Parliament remain fundamental and everybody has those rights," Mr Robertson added.

More so, Mr Thomson, his lawyer said, has been anticipating scathing remarks coming from the Coalition without regard for his basic rights, first as an Australian and as member of the Parliament.

"I think it is disappointing to occasionally in this matter hear politicians who, in usual circumstances would strongly defend the rule of law, are prepared to actually rip it up for partisan political reasons," Mr Robertson said.

Along with the latest pleadings, Thomson had instructed his defence team to submit a handwriting analysis, which The Daily Telegraph said, showed that Mr Thomson's signature was forged on three occasions and by three different persons.

The documents support his claims of innocence, Mr Thomson's lawyer said.

But the Labor MP's latest action, according to opposition workplace relations spokesman Eric Abetz, came both as a surprise and a disappointment.

"This is simply another delaying tactic ... This is a very weak argument being put forward, but a desperate argument by someone who clearly does not want this report released," Mr Abetz told ABC.

He added that Mr Thomson would not be able to point on any legal precedents that would support his new pleadings and "expect the committee to reject those very, very weak arguments and move to publish the report."