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 injury.” Fed. R. Civ. P. 65(b)(1)(A). To obtain this relief, a plaintiff must demonstrate: (1) a likelihood of success on the merits; (2) a likelihood of irreparable injury in the absence of preliminary relief; (3) that a balancing of the hardships weighs in plaintiff’s favor; and (4) that a preliminary injunction will advance the public interest. ''Winter v. Nat. Res. Def. Council, Inc., 555 U.S. 7, 20 (2008); M.R. v. Dreyfus'', 697 F.3d 706, 725 (9th Cir. 2012). Under the Winter test, a plaintiff must satisfy each element for injunctive relief.

Alternatively, the Ninth Circuit also permits a “sliding scale” approach under which an injunction may be issued if there are “serious questions going to the merits” and “the balance of hardships tips sharply in the plaintiff’s favor,” assuming the plaintiff also satisfies the two other Winter factors. ''All. for the Wild Rockies v. Cottrell, 632 F.3d 1127, 1131 (9th Cir. 2011) (“[A] stronger showing of one element may offset a weaker showing of another.”); see also Farris v. Seabrook, 677 F.3d 858, 864 (9th Cir. 2012) (“We have also articulated an alternate formulation of the Winter'' test, under which serious questions going to the merits and a balance of hardships that tips sharply towards the plaintiff can support issuance of a preliminary injunction, so long as the plaintiff also shows that there is a likelihood of irreparable injury and that the injunction is in the public interest.” (internal quotation marks and citation omitted)).