Greenland, war powers, and presidential limits

As protestors clash with some 3,000 federal immigration agents in the Twin Cities, we look at the legal issues with law professor Emmanuel Mauleón and Brennan Center for Justice's Elizabeth Goitein. "The principle that the military should not act as a domestic police force goes back centuries, all the way to the Magna Carta," Goitein says. "I think the reason for it is obvious: If a leader can turn the army inward against the people, that can be a very powerful instrument of tyranny and oppression."

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