Plaintiff M1/2021 v Minister for Home Affairs

This proceeding concerned an application for a constitutional writ brought by Plaintiff M1/2021 against the Minister for Home Affairs in the High Court of Australia. The core of the dispute revolved around the proper construction of section 501CA of the Migration Act 1958 (Cth), an issue that had been the subject of numerous differing judicial opinions in the Federal Court and Federal Circuit Court. The Court was concerned with whether the present case was the appropriate vehicle to definitively resolve this contentious legal question, particularly in light of previous decisions such as *Ali*.

The legal issues before the Court included determining the correct interpretation of section 501CA of the Migration Act and whether the plaintiff's circumstances gave rise to a jurisdictional error. A significant aspect of the Court's consideration was whether this case presented the optimal factual and legal matrix for resolving the ongoing debate among lower courts regarding the application of this provision, especially in relation to non-refoulement obligations. The Court also considered the procedural path forward, including the possibility of proceeding by way of a special case.

The Court's reasoning focused on the need for clarity and finality on the interpretation of section 501CA. It noted that while the reasoning in *Ali* was substantially similar to that in the present case, there were differing views among judges below. The Court expressed a preference for resolving the issue definitively, suggesting that the present case, lacking factual controversy, could serve as an appropriate vehicle. The parties were directed to prepare a special case to facilitate this resolution, with consideration also given to an application for an extension of time.

The Court made orders for the parties to prepare and file a special case by 13 April 2021, referring the stated questions to a Full Court for consideration. Procedural timelines were set for the filing of submissions and other materials, with the intention that the matter would be heard and determined as a special case. The Court also noted that the parties would need to monitor a forthcoming Full Federal Court matter, *FAK19*, which also concerned the correctness of *Ali*, and that these matters could potentially be heard together.