It comes as the Government tries to head off a potential internal split over who pays for the yes and no cases in a gay-marriage plebiscite.
Competing marriage-equality bills have marked the return of parliament in Canberra
Bill Shorten introduces Labor's same-sex marriage bill Source: AAP
The Opposition Leader is championing his bill to legalise same-sex marriage, while the Greens say their legislation has a better chance of cross-party support.
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