Fresh claims made by James Ashby about the Peter Slipper scandal should be assessed by prosecutors, Labor MP Michael Danby says.

A Labor MP wants prosecutors to assess whether James Ashby has committed perjury.

Michael Danby says Mr Ashby has told contradictory stories to the Federal Court and to TV about whether he was offered a Liberal Party job if he took action against then Speaker Peter Slipper over sexual harassment.

“Accordingly, I will be writing to the Commonwealth Director of Public Prosecutions, inviting him to immediately investigate whether perjury has occurred,” Mr Danby said in a statement on Monday.

Mr Danby will also raise the matter in parliament.

Mr Ashby told the Nine Network on Sunday that federal Liberal frontbencher Christopher Pyne had assured him of a job and a lawyer if he chose to return to the political scene after taking on his employer Mr Slipper.

Mr Ashby wrote in his diary that Mr Pyne: “Said a lawyer would be paid for as promised and I would have a job – state LNP politics or federal – if I chose to come back.”

But the former adviser said in a Federal Court affidavit in his case against Mr Slipper: “I have not been paid or promised any financial or other benefit or consideration … if I make any complaint or commence such action.”

Mr Pyne said on Monday he had indicated to Mr Ashby in 2012 that if the Liberal National party won the Queensland state election “that would be a chance, potentially, for him to get out of Mr Slipper’s office”.

But Mr Pyne said the facts showed that no job or lawyer was provided.

Liberal MP Wyatt Roy, who met Mr Ashby before he launched his legal case, said that in 2012 he had given him the name of a lawyer and told Mr Pyne, without naming Mr Ashby, that a Liberal staffer had made a harassment complaint.