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Video shows alleged Paris gunman purportedly pledging support to ISIS

A new propaganda purportedly shows the alleged gunman in the Kosher grocery story shooting in Paris Friday purportedly pledging his support for ISIS. Meanwhile, hundreds of thousands gear up to take part in a unity rally in Paris in wake of terror attacks. NBC's Richard Engel reports and former White House Middle East Adviser Marc Ginsberg and former FBI profiler Clint Van Zandt join to discuss.

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