Drone expert Brett Velicovich calls out security lapses at the Trump rally that led to an assassination attempt on the former president.Drone expert Brett Velicovich calls out security lapses at the Trump rally that led to an assassination attempt on the former president. Read More4fdff4f6-eda0-54dd-ba0a-7dd49b54425f, fnc, Fox News, on_air, on_air|america_reports, politics|person|donald_trump, primary_politics, video The Latest & Breaking Videos on Fox News