A little late, and unlikely to succeed (again from ABC):

The Democrats want laws changed so Australia's involvement in any military conflict in the future requires parliamentary consent.
The Democrats hope to introduce a bill to that affect in the Senate today.
The current war is the first time an Australian Government has committed troops without the majority support of the Parliament.

Personally, the last line is of real interest. I hadn't even wondered about that issue (as far as I recall House of Reps supported and Senate did not). We are accustomed to the Senate rejecting something the government dominated House of Reps passes, but it may be that this is actually a first.