Federal Rule of Civil Procedure 65(a)

(a) Preliminary Injunction.
(1)Notice. No preliminary injunction shall be issued without notice to the adverse party.

(2)Consolidation of Hearing With Trial on Merits. Before or after the commencement of the hearing of an application for a preliminary injunction, the court may order the trial of the action on the merits to be advanced and consolidated with the hearing of the application. Even when this consolidation is not ordered, any evidence received upon an application for a preliminary injunction which would be admissible upon the trial on the merits becomes part of the record on the trial and need not be repeated upon the trial. This subdivision (a)(2) shall be so construed and applied as to save to the parties any rights they may have to trial by jury.