Re Coldham; ex parte Brideson

The High Court of Australia considered the application for a writ of prohibition in *Re Coldham; ex parte Brideson*. The applicant, Mr. Brideson, sought to prohibit the respondent, Mr. Coldham, from continuing proceedings in the Federal Court of Australia. The dispute concerned the validity of certain regulations made under the *Migration Act 1958* (Cth) and their application to Mr. Brideson's immigration status.

The central legal issue before the High Court was whether the regulations in question were validly made and, if not, whether the Federal Court had jurisdiction to entertain Mr. Brideson's challenge to them. Specifically, the court had to determine if the regulations were ultra vires the power conferred by the *Migration Act* and whether the Federal Court possessed the constitutional power to grant the relief sought by Mr. Brideson, given the nature of the proceedings.

The High Court reasoned that the regulations, by purporting to create a new category of persons who could be detained, went beyond the scope of the powers delegated by the *Migration Act*. The Act provided for detention in specific circumstances, and the regulations sought to expand this power in a manner not authorised by the primary legislation. Consequently, the regulations were held to be invalid. The court further held that the Federal Court, as a federal court invested with federal jurisdiction, had the power to grant a writ of prohibition to prevent the continuation of proceedings based on invalid regulations.

The High Court made absolute the order nisi for a writ of prohibition, directing that the proceedings in the Federal Court be stayed.