Why do Trump supporters believe that a wall will make the United States safe when the data suggests a wall will do nothing of the sort? Eric Caron, former US Special Agent and diplomat debates Thom Hartmann on the effectiveness of a border wall, and Thom's callers from both sides of the issue debate pasionately.

Thom debates Eric Canon, author of 'Switched On, The Heart and Mind of a Secret Agent' - Thom's diverse callers take on this episode's big question- will a wall on the southern United States border provide security for America?- are southern immigrants really a threat?

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