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WATCH: Dayton mayor speaks to press ahead of Trump visit PLUS: How can the FBI combat domestic terrorism

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Dayton mayor Nan Whaley speaks to the press. PLUS: Why isn't the FBI doing more to combat domestic terrorism? Katherine Schweit, a former FBI agent who was in charge of the active-shooter program and Matt Miller, former chief spokesman for the justice department under attorney general Eric Holder join Andrea Mitchell to discuss.