Dyson Heydon set to reveal commission future today

After more than a week of deliberating Dyson Heydon is due to reveal whether he will stay on as royal commissioner overseeing the inquiry into trade union corruption.

The ACTU, CFMEU and AWU have all submitted to have Mr Heydon disqualify himself over perceived bias, after accepting an invitation to speak at a Liberal Party event.

He has since admitted he "overlooked" the political connection of the Sir Garfield Barwick address.

After several delays, Mr Heydon will announce his ruling at 2pm AEST on Monday.

On Friday unions made further submissions after it was revealed counsel-assisting Jeremy Stoljar spoke to Mr Heydon about the function before he agreed to withdraw.