Can Trump declare a national emergency to build a border wall?

Jessica, a migrant woman from Guatemala seeking asylum, walks to the edge of the border wall before illegally crossing into the United States with her sons Francisco, 5, and Jorge, 9, from the outskirts of Tijuana into San Diego County December 1, 2018. Picture taken December 1, 2018.   REUTERS/Adrees Latif - RC1C78F00810

Senior Fellow William Galston discusses whether President Trump can legally declare a state of emergency to build a border wall and the obstacles he would face in attempting to do so.

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