Today, Senator Cash said: "Merely because behaviour is alleged in a court process does not make it a finding of fact."

"It would mean the [construction union] could allege anything against anyone any day of the week. Should we not allow the court to undertake its due process?"

Senator Cash would not comment on whether she informed Mr Turnbull or cabinet of the allegations prior to Mr Hadgkiss taking up the role in December or whether she had received legal advice.