Dallas cop shooter who wanted to “kill whites” was a follower of hate-group Nation of Islam

What we know about the Dallas gunman: Army veteran reportedly said he ‘wanted to kill white people’.   An undated photo posted on Facebook on April 30, 2016, shows Micah Johnson, suspected of the sniper slayings of five law enforcement officers in Dallas on July 7, 2016. Micah Xavier Johnson, 25, is shown in this…