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The Obama administration, for instance, created a precedent for overseeing deportations, but even then, accomplishing high numbers necessitated substantial resources. The logistics to support Trump's plans, like hiring more personnel or building detention centers, will require congressional appropriations—a potential roadblock to his ambitious vision.
Military Involvement in Immigration
Trump has floated the possibility of using the military to aid in enforcement activities. However, a statutory prohibition on military involvement in domestic law enforcement motions complicates this idea. Hence, even declaring a national emergency won't bypass legal constraints on federal troop usage.