washington federal prosecutors issue grand jury subpoena seek business record people work former u.s. national security adviser michael flynn private citizen cnn report tuesday cite people familiar matter cnn say subpoena issue u.s. attorney office alexandria virginia target people work flynn contract push job director defense intelligence agency 2014 report flynn late join trump campaign fire white house national security adviser president donald trump february fail tell truth contact russian ambassador unite state flynn attorney robert kelner respond immediately request comment justice department spokeswoman say department comment existence ongoing investigations federal bureau investigation look allegations russia meddle 2016 presidential election benefit trump well possible link trump campaign russia repeatedly deny interfere u.s. election trump administration deny allegations collusion russia trump fire fbi director jam comey tuesday say lose confidence comey handle election-year email scandal involve then-democratic presidential nominee hillary clinton flynn retire general emerge central figure russian probe investigators look whether flynn properly disclose payments clients link foreign governments include russia turkey cnn say flynn associate subpoena russia probe cnn