Deputy Labor leader Tanya Plibersek wants Labor's gay marriage bill to break an impasse on debate in the coalition party room.
Ms Plibersek is expected to second Opposition Leader Bill Shorten's bill in parliament on Monday, as her offer to step aside for a government co-sponsor appears rejected.
She has told ABC radio the bill must go ahead after Liberal MPs advised no discussion would occur in the party room until legislation was on the floor of parliament.
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