New Delhi, Oct. 20 -- US Congress member Ilhan Omar faces an investigation involving alleged immigration fraud and citizenship irregularities. The controversy also involves claims about the Democrat's marriage, financial disclosures and possible political targeting. Omar has repeatedly denied allegations that she married her brother. Her lawyers reject suggestions that she broke citizenship laws.

Sources told the New York Post that federal prosecutors had obtained DNA during their investigation. They reportedly want to establish whether Omar married her brother, Ahmed Nur Said Elmi. The allegation concerns their 2009 marriage and an alleged attempt to secure his green card.

These remain allegations, and the account does not establish wh...