United States v. Alcala-Sanchez, 666 F.;3d 571 (9th Cir. Jan. 10, 2012) (We have not been entirely consistent in our standards for reviewing a claim that the government breached a plea agreement.); citing United States v. Ellis, 641 F.3d 411, 417 (9th Cir.2011); United States v. Mondragon, 228 F.3d 978, 979"80 (9th Cir.2000). Compare, e.g., United States v. Schuman, 127 F.3d 815, 817 (9th Cir.1997) (de novo standard), with United States v. Salemo, 81 F.3d 1453, 1460 (9th Cir.1996) (clearly erroneous standard).