A temporary restraining order is an extraordinary measure, never granted as a right. To grant one, the plaintiff needs to succeed on all four factors: irreparable harm, likelihood of success on the merits, balance of equities, and public interest.(Yes, I've read enough TRO-related stuff that I can recite the verbiage from memory.)

Winning a TRO essentially requires that the judge agree you're going to win your case eventually and that you can't even wait until a preliminary injunction hearing to get some relief. On the flip side, losing a TRO doesn't mean all that much.