Former Greens senator Scott Ludlam will not rule out a return to politics but says the next chapter of his life will likely involve overseas travel and writing.
Mr Ludlam, who quit parliament over his dual citizenship with New Zealand, said a return to politics was not something he wanted to do "in the short or medium term".
"I'm fascinated to learn more about people working on the same kind of work and issues that we do here in Australia but under much more adverse circumstances," he told ABC radio on Monday.
Mr Ludlam said his nine-year run in parliament was good, and although he did not expect to leave so abruptly, he knew no one was indispensable.
"That was something of a black swan event, that did come out of the blue," he said.
Mr Ludlam said his exit was unorthodox and had had an "interesting aftermath".
The High Court will hold a three-day hearing from Tuesday to test the eligibility of seven members of federal parliament.
Mr Ludlam said in his case it was "as simple as not filling out a form properly".
"The due diligence was on me to have done that in 2007 and again last year, and there's no excuses," he said.
"I had to scratch my head a little bit at the tortuous way in which some of my colleagues are handling similar circumstances. Just cop it and handle the consequences."
Mr Ludlum also talked about the personal leave he took for his mental health in 2016.
"I had all the benefits you could possibly wish for and still had a pretty rough couple of months. A lot of people out there are doing it tough," he said.
He was reluctant to disclose his condition publicly but said it was a complex situation he had left too late.
Australian readers seeking support and information about depression can contact Lifeline on 13 11 14.
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