Queensland Police are still assessing allegations made against former One Nation senator Rod Culleton that he threatened a Cairns magistrate, four months after the matter was formally referred to the commissioner.

Queensland Attorney-General Yvette D'Ath referred Mr Culleton to Police Commissioner Ian Stewart, asking he be investigated over a letter sent to a Cairns magistrate on November 15 last year.

Rod Culleton outside the High Court in January. Credit:Alex Ellinghausen

In that letter, then-senator Culleton requested a matter before the court be adjourned, which Queensland Chief Magistrate Ray Rinaudo then referred to Ms D'Ath.

"I am sitting in the Senate on Monday the 21st of November and have foreshadowed a motion ... to recall a number of judges for 'proven misbehaviour'," then-senator Culleton wrote.