Robertson was a Marine and a one-time FBI agent..!!!
http://www.dailymail.co.uk/news/article-3112544/US-Marine-FBI-agent-turned-Muslim-extremist-worked-World-Trade-Center-bomber-radicalizing-dozens-fellow-prisoners-bars.html
The fact the FBI is using people like Robertson as agents may help explain why Mateen didn’t get picked up despite the FBI’s awareness of him.