The dual citizenship fiasco is set to claim another victim, with Labor's David Feeney expected to quit Parliament, triggering a byelection in the inner Melbourne seat of Batman with ACTU president Ged Kearney set to stand as Labor candidate.

The Victorian MP revealed last December he had been unable to find paperwork that proved he had renounced his British citizenship before being elected in 2007, and was referred to the High Court.

The High Court has begun examining Mr Feeney's case and is due to return to the matter in March.