What legal authority does the Trump administration have to detain migrants at Guantanamo Bay?

While the Supreme Court has ruled that the government has lawful authority to hold Al Qaeda suspects in indefinite wartime detention at Guantanamo Bay, the legal authority for holding immigration detainees there remains unclear. The transcript indicates a significant legal distinction between the detention of wartime suspects and individuals arrested in the United States for immigration purposes. This ambiguity forms the basis of the controversy surrounding the Trump administration's plans to use Guantanamo for migrant detention, as it may attempt to bypass legal protections typically guaranteed to those detained on U.S. soil.