WASHINGTON (AP) — The Washington, D.C., police chief ordered more 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.

In a city tense from days of ramp-up toward federal law enforcement intervention, volunteers helped homeless people leave long-standing encampments — to where, exactly, was often unclear. The mayor, meanwhile, left town for a family commitment. And the president told reporters that he was pleased at how the operation — and, now, its direct link with his immigration-control efforts — was unfolding.

“That’s a very pos

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