In this Sept. 16, 2013 security camera image provided by the FBI, Navy Yard shooting suspect Aaron Alexis is seen carrying a shotgun through a hallway at the Washington Navy Yard. He's among recent mass shooters who've legally obtained and owned weapons because of limited weapons laws, lapses in the background check process or law enforcement's failure to heed warnings of concerning behavior. (FBI via AP)
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President-elect Trump dances onstage
