The court’s ruling means that the asylum seekers could be sent back to the offshore centers within days.

Malcolm Turnbull, Australia’s prime minister, reiterated that the country’s policy—which includes intercepting boats before they reach Australian waters—is designed to deter people smuggling. “Our commitment today is simply this: the people smugglers will not prevail over our sovereignty,” he said. “Our borders are secure. The line has to be drawn somewhere and it is drawn at our border.”

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