Dyson Heydon was sent the fundraising flyer promoting his planned speech at a Liberal Party event, which featured the party logo and a donation form, in June, two months before he was forced to cancel the address.

The besieged head of the inquiry into trade union corruption is resisting calls to stand aside and until now had refused to answer any further media enquiries about his relationship with the NSW Liberal Party, after Fairfax Media last week revealed he was billed to speak at the party event on 26 August.

Mr Heydon has since cancelled his scheduled lecture at the annual Sir Garfield Barwick Lecture and the party has said it was "ridiculous" to suggest that, at $80 a head, the dinner constitutes a "significant fundraising event".

But in dramatic scenes at the royal commission on Monday, lawyers for the ACTU forced Mr Heydon to table all his correspondence relating to his plans to appear at the event later this month.