Plaintiff M68/2015 v Minister for Immigration and Border Protection & Ors; Plaintiff M80/2015 v Minister for Immigration and Border Protection

The applicants, identified as Plaintiff M68/2015 and Plaintiff M80/2015, sought judicial review of decisions made by the Minister for Immigration and Border Protection and other respondents. The core of the dispute concerned the lawfulness of the applicants' detention and the validity of the Minister's decisions to refuse to grant them visas, specifically in circumstances where they had arrived in Australia by boat and were subsequently transferred to offshore processing centres. The matter was heard by Nettle J of the High Court of Australia.

The central legal issues before the Court were whether the Minister's decisions to refuse to grant the applicants visas were vitiated by jurisdictional error, and consequently, whether the continued detention of the applicants was lawful. Specifically, the Court was required to consider whether the Minister had failed to take into account relevant considerations or had taken into account irrelevant considerations when making the visa refusal decisions, thereby rendering those decisions invalid. This, in turn, raised questions about the legal basis for the applicants' ongoing detention.

Nettle J's reasoning focused on the scope of the Minister's power to refuse visas under the *Migration Act 1958* (Cth) and the principles of administrative law concerning jurisdictional error. His Honour examined the evidence presented regarding the decision-making process, particularly whether the Minister had properly considered all mandatory and relevant considerations, and excluded irrelevant ones, as required by law. The judgment ultimately found that the Minister's decisions were not affected by jurisdictional error, meaning the visa refusals were valid. Consequently, the Court held that the applicants' detention was lawful, as it was based on their status as non-citizens without a valid visa.