8 C.F.R. 1003.1(h)(1)(i) (Attorney General has the authority both to direct that the BIA refer cases to him for decision and to vacate and reconsider any previous Attorney General decision); Matter of RA, 24 I. & N. Dec. 629 (A.G. 2008) (vacating stay order issued by previous Attorney General); see also 8 U.S.C. 103(g) (Attorney General shall review administrative determinations in immigration proceedings as necessary for carrying out his duties).