There will be some anxious nights of sleep ahead for a group of federal politicians under a dual citizenship cloud who are facing the potential boot from parliament.
The High Court full bench, sitting as the Court of Disputed Returns, heard final legal arguments before adjourning on Thursday afternoon after three days of hearings.
The court returns Tuesday morning and Chief Justice Susan Kiefel noted a decision needed to be handed down as soon as possible with or without reasons.
Barnaby Joyce and his Nationals colleagues Fiona Nash and Matt Canavan have all argued they should be spared the court's wrath. So too has crossbench senator Nick Xenophon.
But the lawyer for former Greens senators Scott Ludlam and Larissa Waters says the pair were right to resign, and argued the other five ought follow suit.
Federal parliament resumes sitting on Monday and Labor will seek to capitalize on the political uncertainty.
The Turnbull government - on a one-seat majority in the lower house -could have a by-election on its hands if Mr Joyce loses.
And Mr Joyce's long-time nemesis Tony Windsor could put up a solid fight if he decides to run again.
For Senator Xenophon the case's outcome doesn't matter - he's already indicated he's leaving Canberra to pursue another tilt in South Australian state politics.
The court has reserved its decision.