One Nation Leader Pauline Hanson has backed calls for the High Court to decide her West Australian Senate colleague Rod Culleton's fate in the Upper House.

Key points: Government alleges Senator Rod Culleton was ineligible to stand for Parliament

Government alleges Senator Rod Culleton was ineligible to stand for Parliament Senator Culleton is calling for an investigation into what he describes a "virtual cancer on society"

Senator Culleton is calling for an investigation into what he describes a "virtual cancer on society" He argues the High Court continuously disregards Judiciary Act, Acts Interpretation Act

Senator Hanson told the chamber that when Senator Culleton nominated to stand as a One Nation candidate for the July election, he claimed he had not breached the constitutional rules for standing for Parliament.

"I took that to be his oath and it was signed and witnessed by a [Justice of the Peace]," Senator Hanson said.

"My fellow colleagues and I support Mr Culleton, but we have seen on too many occasions politicians in this place and the other place who have not been accountable to the Australian people.

"I will not stand here and be of the same ilk."

Earlier, Senator Culleton launched a strident defence of his position in the Senate and argued his conviction for stealing the keys from a tow truck had been annulled after the election.

That conviction, which carried a punishment of imprisonment, was still on his record at the time of the election — which the Coalition is arguing as the grounds for his disqualification.

"In due course, what has been going on behind closed doors will be exposed — both the skulduggery and the acts of integrity of character, that mateship that separates the Australian ethos in a league of its own," Senator Culleton said.

"Certain parties believe they have the vested interest in the Senate seat. Their actions and reactions today reflect that vested interest in securing this WA Senate seat."

But Senator Hanson said the matter should be judged by the High Court, despite him having her personal support.

"I would dearly love to see Senator Culleton take his place here again as a One Nation senator," she told the chamber.

"I believe that I have the support of my other senators.

"I know that Senator Culleton will not be too happy with what I just said."

'Virtual cancer on society'

Senator Hanson says she knows Senator Culleton "will not be too happy" with her stance. ( ABC News: Matt Roberts )

The Federal Government successfully moved a motions in the Senate calling for the election of former senator Bob Day to be challenged in the High Court, and looks certain to have a similar motion passed with regards to Senator Culleton.

Senator Culleton has long railed against the integrity of the High Court, and this morning wrote to Senate president Stephen Parry asking for the Upper House to consider removing "offending judges" from office.

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He accused them of acting in contempt of the "power and authority of Parliament", and described it as "virtual cancer on society".

"Sixty-four years ago this contempt of Parliament started with a set of High Court rules," Senator Culleton wrote.

"An unelected aristocracy decided they and only they would decide what came to the High Court.

"Because they have been allowed to get away with this sabotage of the constitution, every branch of the judiciary has felt unrestrained to disregard that hallowed legislation, and the two acts that complement it made here in this Parliament."

Senator Culleton claimed that in October a senior member of his staff witnessed two High Court judges ignoring the Judiciary Act.

Senate refers Bob Day's election

The Senate has also referred the election of now former senator Bob Day, after the Federal Government argued he had breached the strict rules for members' interests.

Mr Day resigned last week, in the wake of his construction company going into liquidation.

The Coalition argued the former Family First senator was liable for a mortgage on a property he was using as his Adelaide electoral office, despite having sold the property to a business associate.

The Opposition and the Greens supported the motion, calling on the High Court to consider his election.

If the High Court finds Mr Day should not have been elected, there will need to be a recount of the South Australian Senate vote.

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