Donald Trump to return to Butler, PA

Former President Donald Trump plans to return Saturday to the site where a gunman tried to assassinate him in July. Trump will use the event to remember Corey Comperatore, a volunteer firefighter struck and killed at the July 13 rally, and to recognize the two other rallygoers injured, David Dutch and James Copenhaver. Frank Roberson, protection and counterintelligence expert spoke with LiveNOW from FOX's Christy Matino about what measures need to be taken to prevent another assassination attempt.