substantial injury to the party opposing a stay if one is issued, and the public interest. Mohammed v. Reno, 309 F.3d 95,100 (2d Cir. 2002) (citing Hilton a Braunskill, 481 U.S. 770, 776 (1987)). "The necessary `level' or `degree' of possibility of success will vary according to the court's assessment of the other