Former Parliament speaker Peter Slipper has called for a royal commission into the events surrounding the sexual harassment court case against him.

Mr Slipper has given what he has described as a precautionary valedictory speech in parliament, saying he has not decided whether he will run at the next election.

Last year Mr Slipper faced a sexual harassment court case launched by a former staffer, James Ashby.

The case was dismissed but is still subject to a possible appeal.

Former Howard government minister Mal Brough is running as an Liberal National Party candidate in Mr Slipper's Queensland seat of Fisher at the next election.

Mr Slipper has used parliamentary privilege to reveal a story passed onto him by wealthy political hopeful Clive Palmer about Mr Brough's involvement in the Ashby case.

"Mr Palmer mentioned to me at that time that about Easter last year, Mr Brough accompanied by the Member for North Sydney came to see Mr Palmer to ask him to fund James Ashby's legal fees," Mr Slipper said.

"I would hope that the Government moves to see the involvement of members of the Opposition in particular in what has resulted in a situation where there was an attempt to not only bring down the speaker of the Australian Parliament, but also to bring down the government of this nation."

Opposition treasury spokesman Joe Hockey is the Member for North Sydney.

Mr Hockey has completely rejected Mr Slipper's statement.

"That is patently untrue, I have never met Mr Ashby, the matter was never raised in the cup of coffee that I had with Mr Palmer which has been widely reported," he said.

"The matter was never raised in relation to that entire affair."