Greens to support High Court referrals

More federal MPs are likely to face the High Court over their citizenship status after the Greens committed to unilateral referrals from the major parties.

Greens leader Richard Di Natale confirmed the minor party's sole MP Adam Bandt would provide the government with the crucial vote it needs in the lower house.

"If the government decides to refer someone, if the opposition decides someone should be referred, we think we should honour that," Senator Di Natale told the ABC on Monday.