Fmr. FL Rep. David Jolly: Attendees of Arizona rally are putting other people at risk

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MSNBC's Craig Melvin hears from Vaughn Hillyard as he reports from Arizona where residents await President Trump's arrival. David Jolly, former Florida representative, and Dr. Irwin Redlener, Director of the National Center for Disaster Preparedness at Columbia University, also join in the conversation and react what appears to be a mask-less crowd.