Former federal speaker Peter Slipper is expected to learn whether he has permanently halted the fraud case against him on Friday.
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Slipper is fighting three charges stemming from a taxpayer-funded tour of Canberra wineries in 2010.
He is accused of dishonestly using about $1000 worth of Cabcharge vouchers during the trip.
Slipper, a Liberal-turned independent who served as parliamentary speaker in 2011 and 2012, is thought to have been in and out of mental health facilities this year.
He has sought to permanently stay the charges against him, arguing the case would violate parliamentary privilege and is an abuse of process.
His defence barrister, Kylie Weston-Scheuber, said parliamentary business was conducted during some of the travel involved.
To decide whether her client is guilty, she argued, the court would have to place a definition on parliamentary business.
She argued it was not for courts to decide what that definition is.
Parliament, rather than the courts, was the most appropriate forum to investigate the allegations, the lawyer said.
Slipper first aired the argument in the ACT Magistrates Court, and subsequently in the ACT Supreme Court, before Justice John Burns.
Justice Burns is expected to hand down his judgment on the application to stay the charges on Friday afternoon.
If Slipper wins, it will effectively end the prosecution against him.
Commonwealth prosecutors opposed the application, arguing parliamentary privilege did not always protect politicians from criminal prosecution.
Slipper's lawyers have made another application for the charges to be dropped on grounds of mental illness.
In March, the ACT Magistrates Court heard Slipper had been in a mental health facility since January.
It heard he had been in and out of care facilities.
If the current bid to stay the charges fails on Friday, Slipper's lawyers are likely to apply to have them dropped due to their client's mental state.
