WASHINGTON, DC — The Federal Bureau of Investigation is reviewing claims Rep. Ilhan Omar married her brother, The Post has learned. Two FBI agents held an hours-long meeting in Minnesota in mid-October with a concerned party who handed over a trove of documents regarding Omar’s 2009 marriage to Ahmed Nur Said Elmi, a source with knowledge of the event said. At the meeting, first reported by website The Blaze, the agents discussed concerns the Somali-born Democrat married Elmi, a British citizen rumored to be her brother, so he could obtain a green card and study in America, the source said.