New investigative documents released by a state agency have given fresh life to lingering questions about the marital history of Rep. Ilhan Omar and whether she once married a man — possibly her own brother — to skirt immigration laws. Omar has denied the allegations in the past, dismissing them as “baseless rumors” first raised in an online Somali politics forum and championed by conservative bloggers during her 2016 campaign for the Minnesota House. But she said little then or since about Ahmed Nur Said Elmi, the former husband who swept into her life in 2009 before a 2011 separation....