President Donald Trump’s attempt to take over law enforcement in Washington, D.C., is once again testing the bounds of his authority to militarize a major U.S. city.

The capital, unlike other cities, is already subject to significant federal control — and Trump is invoking his emergency powers to solidify it. But the intersection of complicated laws and rules about the use of the military for domestic law enforcement, the deployment of federal agents to the streets of D.C. and the city’s own crime-fighting policies may still prompt legal uncertainty — and inevitable challenges.

Here’s what Trump can — and cannot — do:

Trump said he’s taking…

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