a 2015 protest against donald trump's immigration rhetoric is forcing the former president to give sworn testimony in the coming hours. a lawsuit accuses trump's former head of security of assaulting protestors outside trump tower. their lawyer wants to determine whether trump is responsible for his employees' behavior. >> reporter: for the first time before leaving office former president donald trump will testify under oath. on monday trump will sit for a videotaped deposition in a case stemming from a 2015 lawsuit. he and his company were sued.