Sarah Hanson-Young has flagged she might split from the Greens and support a plebiscite if attempts to legislate same-sex marriage fail.
"Nothing isn't an option for me," the senator told Sky News on Thursday amid concerns the issue could be off parliament's agenda for three years if a government plan for a plebiscite is rejected by the upper house.
Senator Hanson-Young said she would prefer the parliament exhaust all legislative avenues before considering a plebiscite.
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