How do you define ‘wall’? Keeping Washington open may hinge on the answer

Or rather, it might depend on whether Democratic and Republican congressional negotiators can agree on border security measures that meet their mutually exclusive “wall” definition needs. Democrats are firmly opposed to a physical wall – “a big, beautiful wall,” in President Trump’s phrase. Mr. Trump has insisted on an imposing Great Wall-type structure, but at various times he’s said that would be concrete, or could be steel slats, or maybe even based on drones, sensors, and other “smart wall” technology.

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