By Kristina Mani, Professor of Politics, Oberlin College and Conservatory

In his second term as president, Donald Trump has deployed U.S. military forces in rarely used roles in domestic law enforcement.

Besides sending military troops to Los Angeles to counter protests over immigration raids, Trump sent the National Guard to patrol the streets of Washington DC, claiming crime in the city is “out of control.”

As a political scientist who studies civil-military relations, I recognize the fundamental problems of militarizing domestic law enforcement, which the Posse Comitatus Act prohibits.

Militarizing law enforcement risks using excessive force against civilians by troops trained for warfare. And it undermines a constitutional principle, enshrined in the Bill of Rights, that limits th

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