It appears that Omar Mateen was a security guard licensed to carry a gun and had passed all required background checks:

Just something to keep in mind as the “experts” blame gun shows and the background check system over the next few days:

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Related:

Rep. Peter King tells Jake Tapper Omar Mateen was from Afghanistan and ‘trained in the use of weapons’

An oversight? Hillary Clinton offers her thoughts to the victims in Orlando, but no prayers

Orlando terrorist identified as Omar Mateen, ‘U.S. citizen from Port Saint Lucie, FL’; Update: BBC reports not on a watch list

REPORT: FBI investigating possible radical Islamic ‘leanings’ of Orlando terrorist; Update: At least 50 now reported dead

Omar Mateen was reportedly a security guard and licensed to carry a gun [screenshot]

Omar Mateen’s father to NBC News: ‘This had nothing to do with religion’; Son was angry at gay people

Gun ‘experts’ offer commentary after Orlando shooting