WASHINGTON — The D.C. police chief stepped up cooperation between her officers and federal immigration officials as President Donald Trump’s law enforcement takeover of the nation’s capital took root Thursday. National Guard troops watched over some of the world’s most renowned landmarks and Humvees took up position in front of the busy main train station.

The police chief’s order establishes that Metropolitan Police Department officers may now share information with immigration agencies regarding people not in custody — such as someone involved in a traffic stop or checkpoint. MPD officers may also provide “transportation for federal immigration employees and detained subject,” the order states.

The changes, which raise collaboration between the two forces in notable ways, erodes the

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