How Trump's bungling turned his top issue into his greatest liability

Julia Ainsley, senior Homeland Security correspondent for NBC News and author of the newly released, "Undue Process: The Inside Story of Trump’s Mass Deportation Program" talks with Rachel Maddow about her original reporting into how the Trump administration's series of ad libs on implementing Trump's immigration policy led to a cascade of failures that turned Trump's biggest political boon into a disaster that turned the country against him.

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