This week, the lingering allegations over the marital history of Rep. Ilhan Omar (D., Minn.) took an ominous step when Border Tsar Tom Homan publicly acknowledged that the government is looking into the matter.Rep. Omar has long denied that she married her brother to gain his entry into the United States, but the allegation has continued to rage on the Internet and among her critics.The question is whether this is a substantive case of fraud or defamation.Homan stated that he was investigating whether Omar committed immigration fraud, but also noted that the statute of limitations has been an issue.In his...