It's now Labor's turn to deal with Section 44 of the Australian Constitution, as two senators face questions about dual citizenship and their eligibility to serve in Parliament.

ACT Senator Katy Gallagher was born in Canberra, but her mother was born in Ecuador to British parents, and that's where the descent question comes in.  Senator Gallagher says she took all of the necessary steps to renounce British citizenship, which she said included paying the processing fee.  But London didn't confirm her renunciation until 16 August last year - two months after nominations closed and after the 2016 federal election.

Gallagher says she does not feel she should refer herself to the High Court, but the Senate will probably make that decision for her.  "I have acted, at all times, with the legal advice provided to me" by two experts on the matter, she wrote in a Facebook post.

Meanwhile, NSW Senator Doug Cameron has revealed in his citizenship forms he could be eligible for Lithuanian citizenship, but this seems to be possible via a twisted, circuitous route.  His maternal grandparents left Lithuania for Scotland before his mother was born in 1915.  Lithuania allows for for dual citizenship for descendants of Lithuanian citizens who left the nation before 1940.  But in order to get this dual citizenship, one would have to apply for it and Cameron says he has made no effort to do so.

Tuesday is the deadline for members of the House of Representatives to turn in their citizenship documents.