Thank you, Senator Brandis. Advising beforehand is a convention, and Senator Ludlam has said he advised, and you have indicated that your office did not receive that advice. It is a convention. If you look at standing order 74 and, in particular, at 74(5)(c), it says:

in the event that the minister does not provide an explanation, the senator may, without notice, move a motion with regard to the minister's failure to provide either an answer or an explanation.

Senator O'Sullivan? Senator Brandis, Senator O'Sullivan has the call; please resume your seat.