d warrant issued by the court, and then det ained until his testimony can be secured by deposition. Std. ; Fed. R. trim. p. 15(a); see also, e.g., Torres-Ruiz United States District Court , 120 F.3d 933 934 - 36 (9th Cir. 1997) (per curiam). C. Aliens Aliens may be subject to "temporary detention" for up