The Fourth Circuit has confirmed that the Attorney General has an independent statutory authority to appoint (and renew the appointment of) temporary members of the Board of Immigration Appeals. This authority is not affected by the regulation prescribing the authority of the Director of the Executive Office for Immigration Review to appoint temporary Board members. Finally, the Fourth Circuit construed that regulation as permitting renewable appointments by the Director.
The full text of Salomon-Guillen v. Garland can be found here: https://www.ca4.uscourts.gov/opinions/231723.P.pdf