Retired FBI supervisory agent James Gagliano discusses alleged White House gunman Nasire Best’s criminal history and warns about rising political violence in America. #fox #media #breakingnews #us #usa #new #news #breaking #foxnews #whitehouse #washingtondc #washington #dc #crime #crimenews #crimestory #criminal #police #gunman #shooting #politicalviolence #security #fbi #investigation #jamesgagliano #america #lawenforcement #breakingupdate #violence #publicsafety #nationalsecurity #