Cass R. Sunstein, Columnist

Four False Assumptions About Trump’s Wall Emergency

The president’s action is surely illegitimate. But we can’t be sure it’s unlawful.

No blank check.

Photographer: Carlos Barria-Pool/Getty Images

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A full evaluation of the legality of President Donald Trump’s decision to declare a national emergency, and to order the building of a wall between the U.S. and Mexico, is best deferred until the appearance of a supporting memorandum from the Justice Department.

But even now, four points are clear – and they are at risk of getting lost in the national discussion.