(KMOV) -- Federal prosecutors are trying to keep a St. Louis man they claim attempted to attack the White House behind bars, arguing he is a flight risk and “extreme threat” to public safety. Last Monday, investigators in Washington, D.C. say 19-year-old Sai Kandula of Chesterfield rammed a rental truck into barriers near the White House. Kandula is due in federal court Tuesday for a detention hearing. Last week Kandula, a Marquette High School graduate, flew on a one-way ticket from St. Louis to Washington, D.C. Investigators say Kandula rented a truck and then drove to the White House. Investigators...