Bouchard and Gray have announced their candidacies.
If multiple people run, that's good news for Cheney. She won her first primary with less than 40% in a field of nine candidates.
I think it really comes down to who Trump endorses though.
Most likely, although while part of me wants to say Wyoming would be a good Trump/NeverTrump test, he did get his highest percentage of the vote there. The "Utah problem" didn't exactly cross the borders.
Not that it matters but Rand Paul will endorse the same person Trump does because he's always hated Liz Cheney for rather obvious reasons.