MPs are debating whether to haul the Russian Ambassador before them for questioning, after he's twice rebuffed their requests.
Such a step would be extraordinary - Parliament has only used its power to summons someone once, and that was in the twentieth century.
Ambassador Georgii Zuev has diplomatic immunity, which means he isn't obliged to give evidence as a witness.
RNZ understands the Foreign Affairs Select Committee is investigating if it can summons him.
Political reporter Katie Scotcher has more.