WASHINGTON — Public schools reopened Monday in the nation’s tense capital with parents on edge over the presence in their midst of thousands of National Guard troops — some now armed — and large scatterings of federal law enforcement officers carrying out President Trump’s orders to make the District of Columbia a safer place.

Even as Trump started talking about other cities and again touted a drop in crime that he attributed to his extraordinary effort to take over policing in Washington, D.C., the district’s mayor was lamenting the effect of Trump’s actions on children.

“Parents are anxious. We’ve heard from a lot of them,” Mayor Muriel Bowser said at a news conference, noting that some might keep their children out of school because of immigration concerns.

“Any attempt to target c

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