A loophole in federal laws passed under John Howard could allow states and territories to pass laws to allow gay marriage, ACT Chief Minister Jon Stanhope says.

The Australian Greens have introduced to parliament a bill that would overturn a federal veto on laws passed by the two territories.

The bill would remove a section of the Self Government Act, which gives the federal cabinet and the Governor-General the power to amend or disallow any law passed by the NT or ACT parliaments.

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