One Nation Senator Malcolm Roberts will be questioned by government lawyers in the High Court over his British citizenship.
One Nation Senator Malcolm Roberts will face a High Court grilling about how he renounced his UK ties before standing for Australian parliament in a hearing scheduled to include experts from London.
Senator Roberts referred himself to the court last month after finally divulging he only received a letter confirming he had renounced his British citizenship five months after the 2016 federal election.
He is due on Thursday morning to be cross-examined by government lawyers at the High Court in Brisbane about his knowledge and "state of mind" in relation to his UK citizenship.
It will reconvene to hear video-link evidence from experts in London, which is expected to begin about 6pm (AEST), the court's registry confirmed.
The Queensland senator was born to an Australian mother and Welsh father in India in 1955 and came to Australia when he was about seven years old.
He applied for Australian citizenship when he was 19 years old.
The High Court has previously heard Mr Roberts only began the process of revoking his British citizenship about the time he stood for election.
Senator Roberts is considered the most at risk of being disqualified out of the eight MPs caught out by the dual-citizenship rule.
Solicitor-General Stephen Donaghue QC has previously said the Commonwealth would argue for his disqualification if crucial documents were found to be dated after his nomination.