In 2018, Guadian was among the ICE officials who scrambled to reunite nearly 3,000 children who had been separated from their parents after they were taken into custody by immigration officials, USA Today reported. At the time, he had called the process “difficult and time-consuming,” in court records, because the parents of children younger than 5 years old were spread out among 23 detention facilities in 13 states, The Washington Post reported at the time.