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What force is driving the surge in migrants at the U.S. border?

08:32

As the Senate appears ready to rebuke the president’s national emergency declaration, border officials are warning that the flow of people arriving at the Southern border is pushing the system to a “breaking point.” Ali Velshi and Stephanie Ruhle are joined by NBC’s Julia Ainsley to discuss this record surge, what the scale actually is, and what’s driving it.