The FBI is investigating the incident, which occurred near the U.S.–Mexico border, as an alleged assault on a federal officer.
The unidentified individual was airlifted to hospital in critical condition and is currently in custody.
This shooting takes place amidst growing tensions and criticism of federal immigration officers, following the fatal shootings of two U.S. citizens in Minneapolis this month.
President Donald Trump defended Secretary Kristi Noem of the Department of Homeland Security, while Melania Trump called for unity and peaceful protesting.